So it seems like Blue is an OP job that would be like adding Blue Marvel to the Marvel MCU, who would end the movie in five minutes by destroying all the villains.

My observation may be wrong, feel free to correct me. It seems like BLU is an OP job that would need to be weakened to fit into group roles? So it sounds like limited jobs are simply OP jobs that lets the player be Superman for a day, or OP? Maybe they should have changed the wording because the definition of limited conflicts with that.

Or limited refers to them being limited to solo play mostly. I still feel like there are better terms to describe the jobs.