No, the arguments against it are:
1. If you want to play a game you got to put in a little bit of effort.
2. If you want to run a game you got to put in a little bit of effort.
No one is advocating reading the entire book before setting out to play.
But what you suggest is even weirder, what is the cut off?
"Charles, why do you have all sixes in your characteristics?"
"I skimmed through the book and saw that was the maximum you could take."
"But... No, not really. Ah, that's okay! Will fix it in 3 or 4 sessions."
I'm not sure I understand what you mean
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What is unclear? If you don't expect your players to read the rules or follow the the book when they make a character then when do you draw a line? Is it only if they are not optimized or is it also for when they are built "illegally"? When do you, the GM, take your responsibility?