True to an extent, but winning the group can be very important for the last 16 draw. I think it also sends a message that we can compete against the best again in Europe. Massive result psychologically and a very good result points wise. Plus C.L is surely our priority this year? For Conte especially as he's never won it nor have many of our players.
I think the Atletico game was bigger than City but can see both arguments. No reason Morata couldn't play in both and I'd have picked him for both no question.
You are correct that it sends a message in Europe. I will have to disagree on the psychological result. Whether we had that boost or not (i generally agree wins and form at important than rest although we still rest in the cups, so you're damned if you do or don't if you lose your next game) ,we lost against City so the boost obviously wasn't an important enough factor.
CL might be a priority but its not at the do or die stage imo. The big clubs still coast this stage although to be fair we are in the group of death. Not necessarily disagreeing with going for the win and first team against madrid, just that this game was not half as important compared to the City game imo.