I agree with your points about the difficulty completely. I ran a Mythic 11 just as my tank with some guildies a couple days ago and it was a world of difference. It wasn't "easy" but it wasn't anywhere close to what I'm used to. So the challenge is definitely there.
I noticed on my Prot Paladin when first starting on this comp that I was getting wrecked (by the ability specifically called wreck) in Mechagon on the 4th boss and chalked it up to my ilvl at the time and it was very true, now that ability doesn't hurt the same way it did until I hit Mythic 10+.

I'm hoping by posting more videos of each of the dungeon clears it will inspire more to start trying this type of content as its a ton of fun and I want others to theorycraft and make huge gains.

The druid should be a strong healer and if you find a way to make it work well I'm interested in hearing your setup as I sometimes question how effective my Shaman is as bringing the team back up from damage.