Just purchased a Clip+ today. As I have read, the OLED in the has a limited lifetime of ~5000+ hours of use. It’s useless to have the backlight on when charging. I charge my devices at night, and this not only be an annoying beacon of light, but it’s 10 hours of uselessly wasted life-expectancy.
Also, the volume buttons are not needed to activate the display when any other button works fine. This is a waste of battery life, and can be annoying in the dark (especially with the 5-second backlight minimum). Not many people are going to be looking at the screen when (in/de)creasing volume.
Just my two cents.