The problem is... 100% in this case isn't implicit maximum. 100% only show, what's the quality compared to the level.
But I'm with you... that's not logical, because: do the % matter or the pts? If pts matter, why it's possible that a 200pts team beats an 190pts team easily 11:0... the quality difference isn't that height, like 20pts vs 10pts, but both differences are 40%...
If % matter... a result like this didn't have happened: click
It's the same never ending discussion, why a ST isn't a ST? You buy two "similar" ST, one performs, one doesn't... why?
Do key attributes really matter? If yes, why you win only ~3:0 vs 60% weaker team, which has 1:1 gray and key attributes, where you have a lot of 1% gray skillers (= high key attributes)?
Even if you are able to solve the puzzle... every update changes things. Or can you explain, why my team started very good to this season (~8:0 wins) and after that current update, we have lucky results (~1:0) against 60%, inactive teams? Why Costa had a ~4:6 FK-ratio, now every GK saves his FKs? Even the worst 3* keeper?
I really can't say, after the retirement of Costa, I will keep playing. I'm so annoyed and tired by this company (f.e. we all/a lot of manager want club history back... but we are still ignored - they don't care about the player, only caring about money. The question will be: how long does this work?)