@shaow if we have to change only 4-5 players it is EXACTLY like it wsd beforr changes. And despite real life, rewards here come from us, players who spend. At this moment, game's budget raises mostly from youth purchases and positions/role changes. So, even if you like or not, having to change more than 5 players is perfectly fine and healty for game. Who wants performance, have to spend. There are wages and infrastructure maintenance, but, for most, value is insignuficant as players haven t hit yet the prime time.
About balance, yes, there is needed a balance beetween energy lost/ gained but this should come if only we can not handle the energy by using a proper rotation, remember, maximum team limit is 36 players. We all play under same rules , is not only 1 Team Manager who will face enerhy issues, we all do, who hasn t a large squad will strugle with it, but, that s part of game. At this moment, there are a lot of players on market, can easy find decent players with 1-2 stars, budget ones to be used to rest the main superstars when that s needed. In any league , all around game, there are strong games and easy games, rotating players according with oponents is the key.