As a person that didn't use any but AOSP, MIUI feels like a clone of ios, but a bad one. I'll try to provide the issues which wasn't mentioned on previous post.
- Background processes are highly restricted, which leads to issues with messaging apps like WhatsApp. The notifications will be usually delivered late, and sometimes you need to open the app manually to receive messages.
- As an AOSP, TouchWiz and ZenUI user, it's really hard to get used to the UI.
- To unlock bootloader, you have to ask for it and wait for 14 days to be able to do it.
- They add issues and remove good features with every update.
- Face recognition for the unlock works only for some regions.
- Ads in system apps. What the hell?
- Forces you to use Mi services which are fishy. Do you really want to give your information to a Chinese company for free?