a small typo....
I haven't used screen protectors on my devices, past and present. Smartphones and tablets have to be bare, in my humble opinion, in order to enjoy the screen. The question could be similar to, without being vulgar, what condom enhances sex. :)...
another Best Buy, another tab S3.
Yes. You will be losing samsung pay, secure folder, samsung health, and anything else that depends on knox
does the Uber driver app check for root?
I would recommend beginning with ashyx's thread to root first, it covers your options with dm verity and encryption. Read it carefully...