Or they'd be doing what most players did in AD&D: ignoring rules like level caps, using optional rules like 4d6DL1+assign, etc. Considering D&D/ttrpgs are a tradition and most folk learn to play by watching games or playing with others.Not the edition itself. It's openness and ease.
If D&D said dwarves could only be fighters and elves fighters and rogues because that's the lore and culture of 10+ D&D settings, new fans would doing the Abe Simpson in the brothel.
Walk in, remove hat, turn around, put on hat, walk out.
Or, ya know, later editions didn't have those restrictions. 5e isn't unique in that.