Since it's clear by now that the iOS 15 update is mostly just fluff, this is what Apple needs to do:
1. redesign the notification center. It's ridiculous.
On top of that definitely make the "Clear all" button come on immediately when you get even just a single notification. Mine only comes on after a long while and I'm having to constantly swipe to the left and clear each notification by it self. I've had three emails and two texts plus news, and no "Clear All" in sight then I have to exit out of these manually or go into each app and do it that way.
2. give us an LED visual for notifications in addition to sound and vibration. Allow us the change the colors of the LED based on what the notification app is.
The fine folks who like things the way they are can just turn any or all of this off and be constantly hitting the screen on their phones to see if there are any messages when the phone is on mute, much like we all have to do all day long the way it current is.
3. give us an always-on screen for the clock. On the always-on screen we should also be able to choose if we want to see if we have any notifications (the amount and the app) or if we to just want see the clock.
Once again, the people who don't like it should be able to turn it off. No more Apple forcing us to do stuff.
4. add haptic feedback to the keyboard, and make it possible to customize different intensities to your heart's content.
It's beyond crazy that you have no feedback whatsoever if you're typing and the phone is on mute. Those who are concerned with battery or simply don't like this should be able to turn it off.
5. make it possible to adjust volume for independent apps and settings and not this general thing they're doing. Separate volume control for keyboard volume, music volume, ring volume, system volume.
I, for example, would like the keyboard clicks to be much louder than they are but without it affecting the volume on the entire phone or the ring and notifications volume. It's silly of Apple to force it to be like this.
6. add suggestions from the address book as you start a phone number.
Common now Apple, this has been available for the last 15 years on Android.
7. make it possible to customize the texting app in every conceivable way. Font size, bubble size shape color etc.
8. make it possible to schedule a text message to be sent at a certain time/date. This is a basic feature. Compose your message now and schedule it to be sent when the time is right. I used to use this feature all the time when I had to text people who are in different time zones when they have to get the text at a certain time in their time zone but it's way too late for me to stay up to send the text.
9. use an OS-wide clipboard and make cut and/or copy not expire until you, the user, cleans it.
You should be able to copy text now and paste it tomorrow if you want to.
And 9b make it possible to copy multiple copy entries ready to paste any one of them by long pressing, at least the last 10 cut/copies should be possible.
10. in Mail give us the option to NOT go to the next email when you are deleting an email but to go back to the inbox. Those who want to keep things the way it is should be able to turn this feature off.
11. make it possible to move the icons on the desktop anywhere you want to.
At this point this list is at least 5-7 years old.
Apple says they listen to their customers...yeah!