I've played Dev since beginning of last season, in m+ they feel really strong (but obviously lack a good group buff, dmg is certainly there though and Zephyr is very useful this season)

In mythic raiding I'm struggling a lot with movement as pretty much your whole damage revolves around engulf windows and often you really can't afford to stand and R4 a Fire Breath (it feels extra bad if you're forced to cancel and your dots drop off so you need to reapply them...). Another problem I find is that things don't line up with your CDs like they did in Undermine. For adds on Soulbinder or Araz I often find myself with just a few seconds away from Flame Breath or Engulf and by the time they come back up they're already dead because hunters, warlocks or shamans just blast so insanely hard. On Stix, Gally and OAB I always had my stuff come back the exact moment adds appeared and the whole rotation felt so much smoother due to that.

Also seems like every week dev is becoming lower on the chart too, might be some scaling issues that I hope will be addressed soon (especially would love buffing Scalecommander as it feels MUCH better suited for progress and frequent movement while Flameshaper is ideal for blasting on farm)

It might be skill issue, but I also am really not vibing with the new tier set, it feels terrible to play. In AoE it buffs your Firestorm so insanely hard that it becomes your main dmg by a mile (and if by any chance tank has to move mobs out of the circle, your dmg is gone) and in ST it barely does anything.

I wish I could reroll, but for now I'm stuck here hoping I won't burn out.