I watched that drive to survive thing and to be honest it didn't really come across that they had much faith in him when they made the decision, from memory Tsunoda had a couple of bad performances around the decision time and to me it looked like that is what cost him his spot.
Just sounds like their car is a real handful if you're a top driver like Max you can make that thing fly but if you aren't at his level you can't get a tune out of it.
Probably better to put a more experienced driver in it for now.
Aren't they quite limited on how much time they actually get to spend driving the cars and getting used to them?