The point of hybrid classes where you queue as one role or the other (like the Crystal Exarch or classes in WoW) vs having multiple types of utility at the same time is to make it so that one character can do multiple different types of content. We can already do that though with the ability to swap jobs on the same character, FF14 chars are basically a hybrid class just by existing.
Tying multiple roles together into one class/job with a base set of shared abilities causes more headaches than it solves things, just look at how summoner and scholar have been decoupled as time's went on because SE realizes that having the two tied together limits how they can develop the identity of either of them.
The only problem this would really solve is having to level another class, but between roulettes and the armory bonus it's really not that bad to level another job if you want to.
