Volen both of those app stores work fine in tablet form
In fact I've been quite surprised how many apps at least take advantage of full screen in landscape mode.
As mentioned earlier LibreTube doesn't go full screen in landscape, but there are a million other ways to watch YouTube so its not a huge deal
With the tablet being on sale recently I'd imagine more people will start to use it and hopefully that means even better app compatibility down the line
I will say, the battery life on the tab at least with GOS, is pretty damn good. I've yet to even drain it past 50% because it sits on the charger dock when I'm not using it
And yes - the dock speakers work, and it does cap the charge at 90% while on the dock so that it doesn't cause unnecessary battery cycles
Multitask mode is a little different, I'm still getting used to it, but it does work with side-by-side apps too
And, now you can audit yourself if you have GOS on your phone 😂