The thing is that people mention accountability, but what they actually talk about is punishment. Punishing a player for playing bad, for not scoring or something like that. Accountability is about being responsible for what you do given what you can do.
Komarov is no longer offensively skilled, everybody knows that. It's not within his abilities to put up points playing on a shutdown line against top opposition anymore, so he's not going to judged on that.
Nylander (and Marner) has periods where he is puck watching, where he is passive, and where he takes shortcuts to avoid tough situations. That's all things he is very much able to do better, and should do better. Failure to do so is what causes the reaction, to instill habits where keeping aware, keeping active, and doing the grunt work when called for is second nature for him as well.
To tie it back to school, since someone brought it up. You don't blame a kid for not getting good grades in Math when he has a rough time with numbers. But if you have a brilliant mind who is getting nowhere near the grades he should because he is skipping lessons and daydreaming when he should be learning, a reaction is called for.