The devs did in the Fanfest panel. They didn't call it 'lazy', but they described a situation whereas a BLU wouldn't have all the necessary spells for the content and be kicked from parties for it. And that can only happen if someone attempts content before performing the necessary preparations. Which is a double standard because how many people have we seen in Shinryu without their level 70 skills and gear? How many jobs do we see in all sorts of content without the skills that are locked behind job quests, or even the job themselves?
You can if you keep those skills to the Masked Carnivale (thus maintaining the exact state we already have right now), but only work within instances with that limited number of skills.You can't shrink down the number of skills to something approaching other jobs without removing BLU's whole purpose.