Honestly i feel like Blizzard should have just tried out not testing the new raid at all, or at least just on NM or HC to ensure no game breaking bugs. Just tune it low with the expectation that the difficulty should come from having to learn the fight, not from having to do everything perfectly.
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Yeah it's a bit weird how it all works out. I am all for not making it timegated, but not even having it level gated feels like it's kinda undermining the entire premise of getting better at it.
Not really tested it myself though, so might be wrong. Though from what I hear most, if not all the glyphs are easy to get, so there probably isn't going to be a sense that you become able to get to new places either.