Four managers and they have all used Dier when he has been available. I'll take their judgement over yours.We've had three full time managers since Pochettino mate (and even Poch tried to upgrade him with Wanyama). Dier was fine under Pochettino with Toby, Jan and Dembele around him, maybe he'd be fine again with players as good as those around him? I'd rather also try to also bring in a player as good as those to play instead of Dier as well, he is a limited player, if we were open to selling him do you think it would be the likes of Liverpool, Emirates Marketing Project, Chelsea, Arsenal and Man Utd trying to buy him?
I'd like Dier upgraded on, but he is far from our biggest issue at this time. We need to prioritise. With the transfer budget we will have it's unlikely that he will be replaced for another season or two and until the areas that we have the biggest issues in are sorted. He would also be a very good squad player so not someone I'd be looking to sell.