goon Before Sporting, he probably should have come on when we are 3 goals up against Everton and Fulham but that's not the big deal. When we knew Saliba is injured then he should have had more game time against Palace and Leeds, instead of suddenly getting thrown into Anfield a week later etc. Reeks of immature planning tbh.
Then all of a sudden he gets thrown into Chelsea and one of the hardest away ground too. Just don't really make sense overall.
If I were to guess, you are right in the sense Arteta don't really trust players initially and is very conservative as evident from many instances. He only tries something new when his hands get forced (Holding's performance at Ettihad)