I definitely side with the opinion of efficiency here.

I actually see this more frequently than ever it seems.
A tank stands around for a while, party members ask him to go, no responses in chat, improper use of skills, etc.

Are you honestly going to argue that you'll type entire novels of optimistic encouragement to a bad tank, only to possibly receive the reply "No English", or no reply at all, and then continue on waiting for this tank to figure out how to hold their mouse or controller while you waste tens of minutes for them to find their keyboard?

There's a point that you realize someone is incompetent, lost, afk, a bot, or whatever plethora of reasons causes a tank to just stand around for no reason in a dungeon. At this point, it is absolutely acceptable to continue on as their presence is no longer required.