They won't add back the whole mp management or anything like because of something we learned in Mizzteq's interview during the Endwalker Media Tour.

If we make it too intense, the number of people who can clear the content will be very limited. We don’t want to have a situation where somebody is just healing the whole time or have to have to manage MP constantly,” s
It goes against the accessibility they're pushing for and you can see that with all the changes. Aggro too hard? Just get rid of the damage penalty and have tanks in tank stance. Also no need for Diversion anymore since that was appartently too hard for dps to press even though it lasted 30 seconds and had a huge effect. This also reduced the burden on tanks to make sure they manage their provke+shirk. MP too hard to manage? Lower cost of all the spells, add new ways to gain mp back and reduce Lucid's cd from 2 minites to 1.