First of all: well done, it's nice to see Ferals finish a M+15.
But the video just proves how ineffective ferals are in M+.
Just look at the trash fights, which are the biggest part in almost every M+. Multi dot every single trashmob to be on par with the tank on small packs(2-5) and even worse on bigger pulls, instead of e.g.: "charge - charge - eyebeam" to deal way more dmg.
An advantage the 5 druid groups had is their stealth, they can skip trash other groups can't or trigger 10 min potion cd with inivs.
I don't want to lessen their accomplishment, but I don't think ferals are in a good spot just because of this.
Keep in mind that a lot of people don't run M+10 or higher and in lower keystone dungeons the situation becomes even worse.