I have never seen too many piano players who play a 5 finger chord on the left hand, particularly below C3 or C4, gets way muddy down that end.

And I suspect that those who use "Full Keyboard Mode" are possibly mostly playing a max of about 3 notes with the left hand and in most cases 2..

You certainly don't need to be playing the root using the arranger bassline, and even less if you are playing the bassline yourself with the left hand and the rest with the right. I know thats the way I play.

One finger two finger, three finger, doesn't much matter if you are expressing your art in a way that connects with others and gives them a glimpse of you.

Dennis