How about Settings go back to where I last had it instead of repeatedly punting me back to the updates page to show me the update I’m not interesting in presently downloading? And haven’t been the last 20 times it forced me to look at that page instead of the page I wanted to go back to?
Or better yet, give me an ignore update option like MacOS X used to offer. You know, back when the user and their usability was considered more important than Apple’s marketing urges.
How about an option to speed up the GUI? Even on the latest and greatest iPhone, at times the GUI is just sluggish to react. If I can think and tap faster than the GUI is moving, I want the GUI to speed up.
How about an option for Mail to drop back to the parent mailbox after putting away a message rather than just jumping to the next message, read or not?
How about a lock screen that makes use of its vast space to show battery and weather widgets where you can actually decipher the text instead of 1-mm tall characters to save huge blank space for the display of notifications I’d never allow to pile up on my lock screen?
I don’t need five different ways to launch the camera. But I’d appreciate if I could use that lock screen space for a button to launch perhaps an app I often use – unlike camera.
I want the top part of the screen to show me all the details (including wifi calling) and not hide it. I don’t want to have to open CC just to see if wifi calling is active. Make the font or the icons smaller if you have to get around that gargantuan “Dynamic Island”, but show me the information I actually want to see.
How about a CC widget that allows me with just a single tap to activate my AirPods? Like my Mac.
How about Safari let me double-tap a link to have it open in the background?
How about Wallet notifications that actually show up in a timely manner instead of a day later?
How about a precipitation radar chart that actually shows me all data at any time scale without tiling and refusing to draw the part closest to me that I’m likely most interested in? (can’t believe that bug has made it all the way from 16 to 17).
How about the CC toggle for DND remembers to stay open and show me all its options instead of me having to regularly tap the ellipses first to get it to reveal the relevant options I actually use? With all Apple’s incessant raving about AI and ML, you’d think iOS would have learned by now that I’m interested in selecting ‘until next morning’ after seeing me do it about 853 times. I guess they do use lots of A, just not so much I. Like so many tech bros who like to crow about AI.
How about an option to remove that Mail filter button I NEVER USE and instead use that for a button I would constantly use.
How about having App Store reopen the one page I always go to and hence last used, check for updates? Instead of throwing me back to some page where they try to advertise to me some silly garbage app I’d never in a million years ever download for free, let alone pay for. When did Apple turn into some kind of Facebook-like ad whore? Oh yeah, “services”. Right. Spend lots of $$$ on our fancy hardware first to then have it used to be advertised to as if it were some kind of garbage Chinese Amazon device. “We think you’ll love it.”
Fix the iOS 17 Safari bug where it interrupts you from entering a URL because of some background page load.
Give me an option to dismiss notifications right when they pop up without having to leave what I’m doing and without leaving any trace of that notification in notification center.
How about a force reload button for Calendar since syncing is GLACIAL? And nuke/restart just to get it to talk to Google and sync calendar is a caveman technique.
How about an option to simply add music, photos, and movies when an iPhone is connected to a host Mac for sync? Drag and drop in addition to the usual rigid iApp sync. Also, I want to play video that comes in all kinds of weird formats. VLC is great, but Apple should stop trying to throw their weight around and support playback of pretty much any format that exists. They don’t need to do that for creating media (there they can be as conservative as ever), but playback should be super open and without hassle.
How about Apple fix auto correct so it finally stops suggesting complete non-words? (nice example here) Wasn’t iOS 17 supposed to be the crème de la crème of auto correct?
I could go on for days… I won’t though since I don’t enjoy annoying others. 
But next time somebody asks me when an iOS device will replace my Mac, you’ll excuse me for falling over laughing. 