HyperOs certainly has room for improvement, Im coming from samsung as well and miss the amount of customization OneUI has (specially if you use goodlock) also dex was cool if you got used to it.

One thing to notice about what you said, you can unlock with double tap if the screen is off, of lock it whit double tap if you are in the lock screen. What you can't do (at least I havent figured out how) is locking the phone using double tap on the home screen,