I think it's just how glaring those couple of mistakes are. I must admit at least once a game I go "FFS PLOWMAN WHAT ARE YOU DOING" which I don't really do with others. 90% of his game is solid, but 1 or 2 times a game he has a glaringly bad moment.I think Plow's errors are magnified too muuch and that makes him a whipping boy. He is worthy of being in our best 22-25 every week. He is serviceable (at worst) and can do a great defensive job at best
Can we find him a secondary position if he is getting beaten? (and I don't mean playing ressies)
Also given the close games we've been having lately I've noticed those brain explosions seems to happen in the tight moments at important times. I don't think he handles high pressure situations well, which isn't ideal for a defender. That said, he is good for most of the game.
It's what makes him so hard to evaluate, in total he had a good game outside of 1 or 2 moments, but those 1 or 2 moments are so bad it makes you think he needs to be dropped.