Stone sky sea was a weak addition yeah, the numbers it asks aren't even particular relevant to the fights they are tuned for either. It's really more a test of Can you do your rotation for X minutes and do you have enough gear? and even that's a stretch.
The Yojimbo gate is is really closer what I had in mind. That but combined with a wider variety of mechanics to do and a side of having to DPS/Heal through it would be amazing.