I agree. Not just this game, but any game with sliders, I don't believe you'll ever find the "perfect set". I'm not a huge baseball fan, and don't know much about it, but I really enjoyed MLB the Show...up until I tinkered with the sliders. It's like the new "drug". Once you tinker, you keep looking for the next best set...or rosters are released with updated ratings, which in turn will affect your sliders.
What would be interesting, and I thought this was done last year, would be to take EVERYONES slider sets, and come up with an "average" slider set. In other words, compare each slider across the board and use the "average" for that slider, and see what kind of slider set is designed.