Do they need reminding?
I'm coming into this debate quite late, but I regularly see him pacing the touch line. He certainly doesn't sit back for 90 minutes. And as for stony faced...it could not be more irrelevant.
I think there's a lot to be said for trusting the system that the players are well drilled in to come good, and trusting the players to be able to get a foothold in the game if we are struggling. We know that he has no problems reading the players the riot act at half time, and we know he makes formation tweaks during halves, so what is the problem here? If you could actually hear what he was saying or thinking, you would be happier that he is doing all he could to help us win? It is not this obvious thing that by not doing it he holds us back - too regular a change from the system we have devised to help us be more than the sum of our parts leads to us not having a differentiator at all. There are negatives to changes just like there are positives.
I think Poch has done all he can to alter our abilities to be able to play on the counter and on the front foot, and players have commented on how he makes good tweaks during games to positive effect. I read something interesting earlier - I think from Dan Kilpatrick - that said Poch learned that by not venting when every other manager was piling the pressure on us when competing with Leceister, he allowed the players' frustration to build up and that possibly contributed to the loss of heads in the Chelsea game. That is the kind of thing he has also learned - to give a little back when appropriate. But 'doing more on the touchline' is such a hard debate to have, because we have no idea what he is saying, what instructions he is giving, and what plans he put in place before the game. To use 'we sometimes start bad' as a justification also isn't fair - every team will from time to time. It doesn't mean we won't recover. And 'we sometimes start well' doesn't actually lead to good debate in return, it's just meaningless.