If you set protected apps for whatsapp, you will receive msg noification when screen off

What is drop zone?

You can change the setting in phone manager > notification center

You don't need apps, emui have built in function to show batt %

You don't need apps, emui have built in function to show batt %

Not sure it is Android 6 issue or specifically EMUI. Can Samsung Android 6 phone owner confirm interactive icon in notification bar works?

Note 7 and S7 Edge got it with no problem. Vibe X3 MM no problem too.

That is poor I would say
Mate 8 many users here easily at least 8 to 10 hours
Your wakelocks is out of control
Google to understand more about wakelocks
If I use wifi completely I could get another 1+ hour extra
And don't install any so supposedly will improve battery life, memory management, auto task killer , system booster etc - these are useless n only drain battery
Since Android 6.0 all these app are useless as the OS is good enough. Greenify will only conflict with build in Doze

Don't understand  'disable backup'? Is it ever enabled?
I don't use any app. I manually look into each app which needed internet access and either disabled or reset refresh time.
If rooted try wakelock detector

You can't see much info in this app

As said I do it manually
I would say Greenify will conflict with built in Doze. I will not recommend installing it. It might be useful if phone is rooted n Infact in most unroot phones won't help much too

What is the phone standby time?