IMO, if they want to turn blue mage normal, they should first finally make an option in duty finder that makes your abilities stay when syncing down.

One of blu features right now is that its the only job in the game that doesn't get gutted when syncing to any level. I can get set of 70lvl spells, bring them to alexander and still have as much fun playing it on 60, as i do on 70.
Turning blu into normal job will make it commit sudoku on sync-down as well, leaving 0 options for players to play old extreme/savage content synced without any penalties.

And before you mention unreals - come back when they stop removing previous unreals from the game every time patch hits. As of now, they only partially do that function
And before you say that extreme/savage doesnt matter - well, yikes but alright.

Another part is that blue being not a standart job makes people do some otherwise considered "weird" things in hard group content, like staying low health for revenge blast. It gets some more juice out of existing content, which i assume would be somewhat, if not barely, taken care of if df setting is introduced. Jobs do play differently after all.
(also current blue mage is one of the most fun things i did in shadowbringers, and i'm not the only one, but oh well)