Players knew everything about the rack in the old days too, and they did check every time before breaking.
There was even Mike Sigel's tape about 9ball racking, available way before rules were changed.
Rules were not changed because everybody started breaking well, rules were changed at a period when participations declined, since most players couldn't keep up any more with the best players (better breakers and run outers), bad prize money distribution played a part too.
In the beginning, they made the break too easy....
After that, came the internet era and wide distribution of total pool knowledge, thus leading to a total level increase and less gap between top players and the rest.
Then they made the break harder, which is reasonable, but eliminating the break factor in any way is overacting, leaving better players unprotected, taking out completely the spectacular part of the game, thus leading to another decline in participations now.
9ball is on the wrong path now, and this has to be dealt with.
You didn't have players of old taking 5-10 minutes fussing with the rack before breaking, re-racking, lather, rinse repeat... at least to my limited knowledge and recollection of what I've read over the years.