While I will miss collecting Myth appearances on alts that will never do +10s or Mythic raid this is probably a healthy change as currently I’m almost demotivated from trying Mythic raid as Heroic raid is more efficient for collecting Myth appearances.
But with Myth raid drops being so RNG and stingy…and M+ Myth vault slots also being RNG there is a risk that a toon regularly clearing high keys or Mythic raid may never be able to collect the full set before the season end. I’d like to see some bad luck protection…like maybe adding armor pieces with the Dinar vendor that can be catalyzed , allow Myth level crafted pieces to be catalyzed, or perhaps awarding the full set appearance for some achievement like CE or 3000 IO.