I think the accusation that rolling leads to broken high scores is silly, really. A player having one 17 or 18 starting out isn't going to break the game or end the world, or even really change things over much, other than make them feel a little bit more confident in the first four levels of play (after which the difference is effectively nullified by the potentials of player choice). Even a character that rolls one 18, puts it in their racial ability bonus ability score, and starts with a 20, is only going to have a relatively small buff to their specific by-class capabilities for the first four levels or so, after which the difference goes away. I've had a character that has started with a 20 in her core offence state, and she didn't overshadow the group or obliterate encounters or break the game. She was *competent*, and generally hit what she shot at, early game. Past level 4 there was really nothing to report. I've also had characters that started with a 15 in their core offence stat, no racial bonus, but who has, by level 11 now, had quite a lot of occasions where her actions have unwittingly overshadowed the attempts of others, and I've been trying to let it happen less by making different choices. Ultimately, it's not a big deal, beyond the first few levels, and it's not much of a big deal even then.
The accusation that it will mean players starting out with super high stats across the board is ridiculous - in reality, no-one is going to sit at their computer hitting re-roll for the literal hours on end it would take to get three 18s... and if they want to waste hours and hours and hours of their life doing that instead of actually playing the game, that's on them.
I wonder if you would use the same arguments for infinite point buy system ...
I mean, the result is the same ... you can create stupidly overpowered character, just as if you either "waste hours and hours and hours and hours ... wich is on you" ... or if you simply get lucky and roll good numbers anytime sooner.

So what if someome will want go on adventure with his hero named OPMasterPWN ... whos statistic are 18 18 18 18 18 18

"
Ultimately, it's not a big deal, beyond the first few levels, and it's not much of a big deal even then."
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and if they want to ... doing that instead of actually playing the game, that's on them."