Right at 4 minutes Yoshida basically admits the game is very casual and 4 man content in Mythic type content would lead to wipe fest.

https://www.youtube.com/watch?v=C79Oc_HRo1U

This kills me a little on the inside because the 4 man content needs to evolve into a more Mythic type system just to have it there as a challenge.

It does not even need to be progression and could be literally only glamour or mounts for all people would care.