People wanted Blue Mage in FFXIV to actually play Blue Mage in FFXIV. People being upset that an arbitrary line was drawn solely for this job when every other job has been restructured to fit the game it's in is perfectly valid. Blue Mage is no more unworkable in the trinity than Red Mage was.

You can be excited for this iteration of Blue. I think most people who want to raid as it are happy with what the solo content represents and how true to the flavor it is. That doesn't mean the dev team could not have done a better job in regards to its interaction with the rest of the game. They absolutely could have.

The answer to jobs and problems like this shouldn't be limitation, it should be expansion.