Belief has nothing to do with it.
iPhone + Airpods + Apple Watch.
iPad Pro + Apple Pencil + Apple TV.
iOS only apps such as overcast, tweetbot, fantastical and spark.
Services such as Apple Pay, continuity and airdrop.
Find me the competing alternatives which work just as well, assuming they even work at all.
AppleTV is the most crashy and infurating device I have used since Windows 95. I have had several and they are garbage.
They also don't do the basics like "receive what the iPhone is trying to send" or "show me the content I want to watch". Or "play a movie without crashing in the middle of it." I don't know how that "just works". I
iOS (your first three examples) is famous for being endlessly hit and miss. Sometimes updates kill it. Sometimes updates kill the battery life. Sometimes i just slows down irreparably for no reason -- typically right before new hardware is released. Sometimes it's horrible and you want to downgrade but you're not allowed. Sometimes an update kills facetime (an advertised feature) and you can never get it back until you buy another thousand dollar cellphone or sue the vendor. Ridiculous.
All of those issues are extensively documented by millions of users and class-action participants. There is nothing "just works" about it.
The only thing that Apple is worse at than software are services. I am a paid iCloud user -- I joined when it was dot mac. The uptime record is atrocious. It gets features and then they are taken away. SEARCH is garbage. I can't search my own mailbox in the web client. It's horrible and does not get better, unlike commodity free services. And I have to pay for the privilege of using it!
https://www.macrumors.com/2011/05/07/steve-jobs-reaction-to-mobileme-launch-and-other-anecdotes/
Photos were storable in the cloud for awhile and then they weren't. Then I had to upgrade my cloud database to a format that precluded my iPad and my iPhoto from accessing my photos. Totally insane.
I could go on, and you know it. You are willfully ignoring Apple's terrible, horrible track record when you say that Apple products "just work".
I know a guy with a Mercedes who has exactly the same delusion. It's in the shop constantly, but he goes on about the quality of his high-end luxury car.
EDIT now more of their horrible product history is coming to mind. Airport and Airport Extreme = sometimes work sometimes no work. Year after year, generation after generation. Eventually they just stopped trying and quietly phased them out. Time machine same thing -- fails to back up for no reason, fails to restore for no reason.
Anecdote: I once took a failed time machine restore to the Apple store for help because I was panicking. User had backed up a lifetime of photos on an Apple time capsule using Time Machine and a high-spec CTO MBP which promptly failed.
I was told by multiple people at the Apple store (and you can check this out) that Apple does not offer support or guidance for Time Machine because the liability to Apple is too great.
So the developer and vendor of a bad product, designed to help people with disaster recovery, has (or had in around 2012) a policy to refuse to support the product if it malfunctions during a disaster recovery.
And in classical Apple style, the dialog box offered no information about the error or how it could be recovered.
(I got the data back eventually but without the help of Apple or Time Machine.)
The emperor has no clothes, people.