I find the variation is pleasantly varied

For example, I am currently playing through a historical sim league started in 1965 as the NY Yankees. My pitcher Al Downing held on to win almost 300 wins while in real life he topped out at 123. Or another example off the top of my head in an opposite scenario is a 28 yr old Goose Gossage JUST debuting at 28 yrs old after lingering in the minors as a mediocre starter even though he was a huge top 10 pick/prospect. I LOVE playing through historical era's with real players and seeing how they play out in an OOTP world