In my search for safe, minimalist and reasonably good looking android phone launchers I've come across
Mako and been using it for a couple of months now.
One thing I love operating devices is using physical buttons as little as possible. Ie, locking the screen with a double tap. The main problem with this gesture is that apps enabling it need full access to your phone, so a no in Mako. Fortunately the one-plus has a quick settings button to do that.
On my tablet I had to go through the accessibility shortcut to achieve the same.
Here's a screenshot:
