So... This is the "improved encounter design"?

[Morphiana]

Yoshi says before DT launch they'll start changing encounter designs yet people expected they'd change those designs starting in 7.0 despite the fact that those were likely in the testing stage at the time he made the announcement. They weren't going to re-work everything 7.0 had coming when he announced they'd make those changes based on feedback after resisting said feedback for so long in Endwalker.

The reason we're likely to see the majority of those changes in 7.2 is because that gives the devs time to build the encounters from the ground up with the new designs in mind and not just tack on a few things here or there. That's why 7.2 will be the true test, because they'll have had the time and feedback from 7.0 to design fights with the updated methods.

If they mess up 7.2, well they said they'd try new things, make mistakes, and make corrections in future fight designs based on feedback (and I'm sure based on retention rates too). If 7.2 is messed up then 7.4 would be strike two or three depending on how people look at it, both of which are real bad which SE knows.

There's a lot riding on this for them. WoW has mostly got their content back up to snuff to be a competitor again. 7.2 will be the first major raid patch after the new WoW xpac. They can't afford to lose all those subs back to WoW by messing up right after a very divided DT launch has already depressed the user base.