Screech lax isn't a thing. Itiswas an issue because it affects crit damage in a lot of extremely common scenarios that I pointed out above. This is because crits ignoring stat boosts, screens, etc are determined by the number of stat boosts.
Yeah sure I know the mechs, but as Snorlax learns Screech only in gen 4 and above according to PS! I did not understand why you were talking about it. I mean, unless you discuss GSC Hackmon it's pointless if it does not learn the move.