I don't get the OP. Are you saying that playing outside of a handful of pure-raiding hours shouldn't give your character a (albeit negligible) advantage?
Are you saying that new players that ding 50 should have the exact same progress as a 50 who's been around since some weeks after launch?
You raid purists have already gotten MMOs turned into the state they're in now, where it's all about endgame and leveling feels like you're rocket-propelled towards it. Heaven forbid they give us something to feel like we're actually advancing our character that we're playing at level 50 in a way other than the gear / raid progression that you've chosen.
In summary, you may complain that a new 50 isn't on even footing... I'd complain that new 50's -have- been on even footing (and except for a few stat points still are) with long-time 50's.