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Yggdrasil,
Couple of things here. First, you're making the grossly inaccurate presumption that the
only reason fixed Mythic is a good thing is because of class-specific interactions. And while they're a plus, they're hardly the only saving grace. Flex Mythic would require every single mechanic to scale from 10 to 30 which honestly, while not impossible, lends itself to less imaginative raid design. A fight like Gorefiend Mythic would never be able to be done in any capacity on Flex without making the fight an absolute joke for smaller raid groups and an absolute fucking nightmare for larger groups. It's not that the encounters aren't able to be flexed, it's that the Flex mechanic simply isn't the best solution from a design standpoint. You can argue that perhaps we need to let the developers make these kinds of concessions in favor of the "overall happiness of the playerbase," but Mythic raiders never accounted for a substantial portion of the game's subscribers to begin with so why force them to make that portion of the game more bland simply to increase accessibility?
Additionally, you've yet to really address this but even if Mythic
was made Flex at some indeterminate point after the original raid is released, how do you differentiate a guild that's 20M strict and one which goes Flex? Even the best guilds occasionally have attendance issues, so should they feel incentive to swap to Flex if a few key players are on vacation while they're farming the instance? What about the possibility that a certain encounter is suddenly much easier at a smaller raid size when you have a large roster? Is it fair for a guild to feel pressure to bench 5-10 people just to get a progression kill? It just opens up the door for so many complications that I don't really think it's worth even considering.
But that's just my personal take on it. I know I'm asking a lot of hypotheticals and I'm not expecting you (or anybody) to be able to answer them, it's just from my pragmatic musings, the cons outweigh the potential benefits. I'm not defending Blizzard's choice to stay with 20M fixed because it's the "lazy" decision, I'm defending it because I think it's the more appropriate direction for endgame raiding.