So please tell me, what does the fact that CoH2 players take their game too seriously have to do with RNG ? The similiarities to sports games couldn't be more obvious. And I'm not reffering to the players here because for them football is a profession so it's completely logical that they take it 100% seriously. But think about the fans. There are plenty of people who consider their day ruined when their team lost even though it has zero actual impact on them.
Your point is basically that you shouldn't take CoH2 seriously because due to the high RNG factor you don't have enough influence on the outcome of the game. (which is bullshit btw) So how much impact does a soccer fan (or any sports fan for that matter) have on the game he's watching ? None, literally no impact at all. And yet it's completely normal in germany to get worked up over a soccer match.
Do you know how dumb it is to get emotionally invested into something you have no control over? You're probably one of those people, and if so, you are retarded. Any true man who has a true sense of logic would not get that emotionally invested to the degree you are talking about. To give you an example go talk to a Surgeon, or better yet talk to a Cardio Surgeon. (My father is one) and he'll tell you (as he has raised me) that the most important thing is 'state of mind', and not to get too high or too low, if you let petty issues (Such as a soccer game result) control your emotions you're bound to have screw ups in life, in driving, in working, in relationships with others, everything and anything. It's one of the major causes along with substance abuse that drives people to make poor decisions. People who grow up tend to be able to make that differentiation, but then again not everyone grows up (Which is probably true for the majority of the COH2 community).
If you still disagree, I would love to see you go under the table with a surgeon who is emotionally invested and is having your definition of a 'Bad Day.' Sure you can sue him for Malpractice etc. etc. etc. but it still goes back to why you don't get emotionally invested into things to which you have no control over.
Each individuals has a capacity to which they can have pure focus/concentration and energy. What you choose to 'waste' yours on, is up to you, but those decisions can easily affect your life and where you end up in the grand scheme of things.
If you know a surgeon, go ask him yourself, if you don't know one, try to find one ask them. I promise you he will tell you that if anything he enjoys watching soccer, has a favorite team etc. etc. But he won't let the outcome of a match adversely affect his overall emotions. I'm over 1,000 miles away from you and I'm certain if you talk to one he'll say exactly that.