I think the topic of this thread is about ease of use. Like the discussion on loading music/video to phone without itunes. Of course, there are always workarounds available for iphone. But none is as simple as Android direct plugging in of harddisk/thumbdrive to the iphone and copy (or play) without the use of intermediary hardware/software. Same with mirroring screen to (miracast) wifi-enabled TV without needing an apple TV box. And flexibility of non-proprieatary BT/wifi-direct file transfer. Like the video said file handling is much more advanced on Android just like your computer unlike the convoluted and messy file handling in iOS. There are also other iphone general UI usability issues as well.
You said all else being equal, you have no reason to move. But it is not equal. Iphone can cost twice or more than the next flagship Android device. To some people that is a great (price) incentive to move.
I have literally never wanted to move files back and forth between my mobile devices and other devices. I guess there are a couple of reasons for that: I keep my files, notes, tasks, and music in the cloud and I stream video from the cloud services we subscribe to (Netflix, Hulu). I don't have time for gaming like i used to before kids. I don't watch video or play games (much) on my mobile devices. Occasionally I might watch something on the iPad when we are traveling, but I have not had any problems getting the videos, podcasts, etc. saved to my devices for offline enjoyment.
I think the reason these discussions can go on forever is because we all use our mobile devices for different things and in different ways. If you use a mobile device for gaming, movies, and other entertainment then I am sure Android is the better platform much like Windows has long been a better gaming platform than macOS. For many people either Android or iOS will allow them to access exactly the same apps, so there really is no difference beyond which devices and which operating system you prefer.
You said all else being equal, you have no reason to move. But it is not equal. Iphone can cost twice or more than the next flagship Android device. To some people that is a great (price) incentive to move.
I can spend $1,000 or $350 whether I want an iPhone or an Android phone. I almost purchased an Android phone a few years ago when I bought my iPhone 6. I stayed with Apple for a couple of reasons, but mostly for the soon-to-be-released Apple Watch. I'm glad I did, because that has been incredibly useful to me. The Android options at the time were bulky and didn't provide nearly as much functionality. The options for Android wear have gotten much better, so I'd be much more likely to switch in the future, but again why change if I can afford the devices I have and they are working well for me?
I've been on your side of the argument before when it came to the PC vs Mac debate. I've never owned a Mac because it was always way cheaper for me to build my own PC with exactly the parts I wanted to use, and I felt like macOS was too rigid of a platform. Back in the 90's and early 2000's there was so much more software available for Windows, and I could customize more things about the operating system. Also, it was much better for gaming and that mattered to me a lot at the time. These days I still run Windows at home and at work (and still build my own computers at home), but I'm much more platform agnostic than I used to be. Over the years between work and home I've used DOS, Windows (starting with 3.1), macOS classic, macOS-X, a number of Unix and Linux distributions, ChromeOS (still own a Chromebook), PalmOS, Blackberry, iOS, etc. Android is pretty much the only major OS I've never used on a personal device, so part of my temptation to switch a few years ago simply came out of curiosity. On the other hand these days the operating system really no longer matters to me. Since I no longer require local storage on my devices I can access my Cloud based files and services from any operating system. That's why I can bounce so easily between Windows, iOS, and ChromeOS. The OS used to matter more to me when I had to care a lot about software and hardware compatibility. If I used my mobile device the way you use yours, I'm sure I would find your reasoning to be compelling. Perhaps I could save some money by switching to Android, but I doubt there would be any gains for me from a productivity perspective. In fact there would be a period of lost productivity as I transition (especially if I don't transition all three devices at the same time). Maybe building my own computers for the last 20+ years allowed me to save enough money to splurge on iOS if I want to

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"I find... that the notifications in Apple are more verbose. There are a lot more of them. More than there needs to be."
I have always noticed on my partner's iPhone that there seem to be tonnes of notifications going days and days back, but I always assumed she just hadn't cleared them.
Is there no way of controlling the volume of notifications? Surely it just depends on how many apps you're allowing to show you notifications - same as on Android?
Of course there is is a way to control this on iOS. You can choose to allow or not allow notifications app by app,and for each app you can choose whether they show as banners or not, whether those are temporary or persistent, whether they make a sound (or a vibration), whether there is a badge icon, show on the lock screen (or not), show previews or not. Then of course many apps that notify will let you customize further to choose specific notification triggers.
Every time you install a new app on iOS, it will ask your permission to send you notifications and you have to allow that. A lot of people just always allow without really thinking about it, and then they never go in and disable or customize their notifications... so they get a ton of them. I think people just get used to seeing them and quickly swiping them away with barely a glance. Wearing an Apple Watch silenced my notifications, but it also made me ruthless about disabling notifications for most apps. I don't need a tap-tap on my wrist for something unless it's really important and/or urgent.
Sean