The M1 iMac is already quite close to a "iPad Desktop", I'm not sure how long it will take until Apple takes the full step and ships an iMac with iOS. My guess is that there will be an intermediary phase where the OS will only allow AppleStore apps by default but can be unlocked. And then one day the "most-affordable iMac ever" will arrive, with iOS...
On a more serious note though, Apple won't let you choose which browser you're using anymore: what makes you think it will fulfill the criterion of a "real computer"?
macOS and iOS let you choose your default browser
Is that why on macOS I can open a window like "About this mac" or any window from a menu bar app, switch away from it with the keyboard...and then not be able to switch back to that same window with the same keyboard shortcut?
Are you aware that, for over 20 years, Apple sold an OS that only let you resize application windows by the lower right hand corner?
I could go on (and on and on) but I'll stop here: Remember when Apple swore by the single button mouse? They said it was the best thing ever. Except the first thing everybody bought for their new Mac was a multi-button mouse... Reminds me of how many dongles you need today because thin is in!