Due to the addition of mythic Shadowlands dungeons into the mythic season system, getting the achievement “Myths of the Shadowlands Dungeons” can take upwards of 8 ENTIRE MONTHS to complete (unless you’re able to do a current-day mythic! I am not). Casual players or solo players are forced to wait for the season to end, which takes (from what we can see) over half a year, to be able to access the dungeons in their scaled down form.
This has the extra side effect of locking mount hunters out of farming- for example, with The Necrotic Wake currently in season, anyone hoping to farm Marrowfang’s Reins is pretty out of luck. I dread the possibility of the seasons in the future including things like King’s Rest or Underrot!
From what I’ve seen, there’s no way to access the scaled down mythics until the season ends, which is a pretty big problem for things like the Shadowlands meta achievement, which requires having done all the mythic dungeons. I would love to be corrected on this, however, if anyone has found a way to get into the scaled down mythics.
It would be pretty great for an option to be added to access “seasonal” mythics as a separate difficulty, so mount farming and achievements can still be acquired without an 8 month wait.