Originally Posted by
Richardbro
It is a clear problem for Blizzard whether or not you agree with it. They were vocally happy with Nighthold having 2000 guilds clearing Gul'dan cutting edge and vocally unhappy with only 800 guilds clearing Kil'Jaeden. It seems to me they want a certain number of participating guilds and clears for mythic content fot it to remain being a use of both development time and the overall health of the high end difficulty.
There are guilds that you might consider not that skilled but after nerfs they are able to clear the content and Blizzard has utilized and been happy with this system this expansion, as they have continued doing so. So yes, the "X" number absolutely matters.