I attribute RDMs barrier to the barriers that ranged physical. They are nice to have but in the long run they just won't be used and become unnecessary with contributing healers and tanks who can do it without any sort of sacrifice typically. For utility, between Sharpcasts, Triple Casts, Swift Casts and Polygots there is a lot of movement in BLM too. SMN can move, sure, but they also have to weave oGCDs that BLM has minimal of.
At this point in game history, casters have largely become a mindset and playstyle change that a player just needs to attune to and adjust for.
