Not OP... a BT kb/mouse has been a great consumer-friendly boost on larger tablets for me but sadly... lots of applications (on Android) don't really take advantage of this. They are still very heavily optimized for touch-only.
Example: MX Player (my fav Android player) does a great job binding keyboard presses to actions (spaceBar: pause; arrowKeys: forward, back, etc..)
In contrast, VLC for mobile lacks this "polish". Mobile browsers are another example where actions could be optimized for mouse input but I haven't come across a browser yet that acknowledges mice as a separate input source.
fyi (for anyone interested in tablet to laptop conversion to lessen gorilla arm):
Zagg Folio for 10" tablets (basically turns a tablet into a laptop). I picked this up a couple of years ago (not too many available for Android, most are essentially flimsy stands). They also have similar for smaller handhelds:
https://www.amazon.com/Bluetooth-Keyboard-Android-Tablets-10...
Using a keyboard has been absolutely wonderful though. It's even saved me a few times when I didn't have my laptop with me and had to ssh into work servers for issues.