How did the early players do it?

[UATrewqaz]

I think the best explination is they knew the proper things to do without probably being able to articulate the "why" behind it.

They just knew "pump ur big draws" and if you asked them why they'd just be like "you can win a big pot"

AKA they probably were doing all the big +EV things right and the few -EV things they did were not that big a deal.

Also remember their OPPONENTS had a lack of this info too, although most fish have no info either.