True, but if you look at todays OMAs, they are thicker than they were some time ago, because more and more sops are written in stone in them. The rest is in FCOMs, agreed, but a lot of references there to the OMA. The main part of todays training goes into memorising articles, sops and endless briefings until we are numb to any real world common sense. I'd love some more hands on rather than "that's not the correct call".
We have come a long way from "don't hurt anything or anyone" to todays manuals who read like the fineprint of fishy software agreements.
The main reason, unfortunately, is not improvement of safety, but lawyers of manufacturers, operators and regulators trying to discard any kind of responsibility by shoving everything to the last one in the food chain.
By asking us to adhere strictly to these sops, all other players wash their hands in the black and white printed jungle.
And we all continue to play the game and quite often the scapegoat.
It's like with some religions:
The problem is not the message, it's the interpretation.