It still feels pretty odd though, if he's seeing BLU's limited aspect as a "Core" and "Fundamental" part of its nature. Given that honestly, it's more of an excuse at this stage, especially when people note how powerful BLU is compared to other classes (Balanced around level 70) performance at level 50. That being, not terribly far away in reality (Outside when you don't have all the relevant spells to do your DPS rotation in which case BLU is massively UP compared to other jobs)
Unless he's sticking to the fallacy that the Learning mechanic can only function in a Limited Job design space (Despite numerous ideas that would make this not be the case, at least noted on these English forums. Who knows if JP forums raised any ideas about the same) and due to that BLU inherently needs to be a Limited Job because without Learning it isn't BLU.
But, it has been noted (Including in JP forums) that nothing about BLU feels like it justifies being Limited. Nothing seems inherently massively OP in a way that can't be easily adjusted (Insta-kill spells, White Wind and low level 1000 Needles). The Learning mechanic doesn't seem like something that is notably prohibitive (Outside the intentional decision to put core DPS spells behind level 50 dungeons and EX Trials. Which is a bit of a back handed play, saying "Gotta Limit BLU because what if someone tries to do dungeons but they haven't learned all the spells people would want them to have" and then INTENTIONALLY designing it so that spells people would want them to have are not only incapable of being obtained solo by BLU, but also have horrendous RNG learn rates. You can't just state that a particular issue is causing a certain design and then make the design actually create that issue in the first place...)
I guess we'll see though... Come 5.x when the first round of updates comes for BLU and people get to see the direction Yoshida has planned and see if more directed outrage crops up.