He was pretty good at the start of the season, at which time we also had Antony unavailable and Amad injured. He was poor in November/December and rested.
He was then back in decent form from around the Villa comeback match and that front 3 of Rashford-Hojlund-Garnacho was generally doing well, so no reason to drop him.
He then seemed to suffer some injury issues around March and probably should have been rested earlier. He only really seemed to return properly for the cup final, when he played well and was an important cog in a famous victory.
I’m not a fan of ETH’s management last season but he generally seemed to get it about right with Rashford.