If Engel played in the same parks with the same bats and same baseballs, he would be a mediocre player. And if Adam Engel in high school tried to play at the MLB level he never would have made the cut, and rather than be developed in a very long and detailed process, probably would have gone on to work in a factory or in some mine somewhere.
If the Adam Engel of 2021 could get into a time machine, go back to 1917, play in a game the same way as every one else, then at the end of the game get back in the time machine, go home, eat 2021 food, take 2021 supplements, train on 2021 equipment with 2021 trainers, etc., and repeat this process for an entire season, I still don't think he's a great player.
You guys are really overestimating Adam's strength and physical capability and underestimating the weight and constitution of the old balls and the size of the old stadiums they used to play in. Go try to hit spitballer or knuckleballer or sinkerballer throwing something that's probably closer to a fishing weight than the balls of today, without these new bats that make everything go father, with all the added challenges of extra OF space and extra foul territory.
I mean come on. It's not called "the dead ball era" because players weren't strong. And in terms of physical conditioning, Adam Engel is probably in the top 10% or so of the league as it is, and guess what, he's a still platoon player now. People were strong back then, too. He doesn't have elite HR power or bat speed now, and he still wouldn't then.
IMO (to make ron883 happy) I think Yermin could maybe be a star back then, with the time machine scenario I laid out for Engel.