I think FUT Champions is the best thing that has happened to FIFA tbh. It is fun to play competitively and test yourself against the best players. Personally, I am never able to get even close to playing 40 matches and often don't get to play it all over the weekend, but it is definitely the most enjoyable experience on the game.
The issue is people saying that they get 'stressed' playing the game. I really don't understand this, it is just a video game so there is no need to believe it is life and death, chill out.
I have no issue with people doing all that they can to win the game, people forget that this has always happened and has been the case in seasons matches before the beginning of FUT Champs this year.
I will also address the lag as this is bound to come up, yes this is an issue and needs to be fixed. Although, I don't really experience that much lag tbh in FUT Champs, so can't say that its a massive problem for me.