KISS launcher is one of the main reasons I gave my iPhone XS to my dad. On iOS I'm not even allowed to place app icons where I want to. The freedom to install any app I want is another main advantage.

Most people just want their defaults to be good enough but there's no reason to limit those that want something that works better for them.

Obviously iOS does some things incredibly well. E.g. gesture navigation on Android is objectively worse than on iOS.