gzt: I'm a new lock user. Current phone is too big to casually pocket It surprised me these features were available locked.

An attacker could increase brightness, blind me, and drain my battery. ; ). With finger unlock, voice unlock, and BT unlock, access to these functions is easy when I need it. It bothers me that I need to remove useful things to secure the lock screen.

I expected an easy toggle to switch this entire tray off for the lock screen. Any different in android p version betas?

That's your actual concern? An attacker could "blind" you by increasing the brightness? Why would someone do that when they could just steal your phone since they have physical access to it?