With 20% global market share, plenty of countries don't care about Safari support.
The main problem with Internet Explorer in its hay day was that they did not play nice with other browser vendors and implemented features outside of the standard. Those features were then relied upon by website developers, causing many websites to only work on Internet Explorer. After all - most people were using internet explorer, why cater to anyone else?
Chrome is not quite in the same position as Internet Explorer was back then, but it's getting frighteningly close. There are several websites that only work on Chrome, and despite me not using Chrome as my primary browser I do have Chrome installed because for some websites I simply need Chrome. This is obviously very dangerous to the freedom of the internet.
Funnily enough Apple forcing iOS users to use Safari actually helps here. Because so many people use iOS and they need to use Safari, website developers need to cater to at least one non-Chrome web browser. That in turn makes it more likely they will also cater to others (e.g. Firefox) rather than relying on Chrome-only features.
There is your list.
Systemwide adblocking, non-Safari browser that wasn't artificially limited, ability to connect bluetooth mouse (mostly for when I used the iPad to remote into other computers), modified keyboard with a number row, file manager, some minor homescreen/launcher tweaks for usability, and one that allowed non-iPad apps to run at a higher resolution (at the time, non-universal apps would run in the old iPhone res, but scaled up instead of running at the higher, newer phone resolution).
I'm sure there were other little tweaks, but the main thing was that there weren't any decent Android or Windows tablet options at the time and while the iPad did many things quite well, there were all sorts of little quality of life things that I was just used to having. They weren't included in iOS and there was no way to (officially) change the launcher or keyboard or any of those other things.
It would have been quite nice to have other software repos besides just the App Store which didn't require me to exploit security flaws to use. Instead I just stopped buying iOS devices after that iPad.
So much for "There's an app for that".
The problem is that it creates a single point at which a state can impose restrictions on freedom, with no way to get around it for dissidents and other people who don't agree with it.
Correction: all the apps that Apple thinks you need, regardless of whether or not it aligns with what you need or want.