Hey, the main idea is to provide an ability for managers to set their players' dedication during the matches (like it is already done for training - you may set your first 11 players to have a rest, or train a bit easier then substitutions).
I've noticed that when I have 3 official games per day, my players get tired even though I do some line-up rotations and sometimes they get very tired while playing not very important match before approaching to much more important one.
Would be great to have an opportunity to set dedication for the whole team, or for some particular players (e.g. older players get tired faster and hence need more time for recovery, so we could lower their dedication during the match).
Also, I can't see the point for the whole team working hard while playing friendlies or some CL matches when you already booked the 1st place in group beforehead. Same for Cup, when you have won the first guest match 0-5 and opponent is evidently worse then you, but your team still plays like insane and wastes energy.
Would be also great to have an opportunity to regulate this option during the match, hence players that work less will get less experience points and less match points.