I agree, Blue Magic doesn't have to be difficult and time consuming and it certainly wasn't fun trying to get someone's Glass Dance and still not getting it after 54 kills before that person just gave up. It also doesn't surprise me that the only other BLU incarnation from an MMO would be followed for ... an MMO (I'm mean the spells not learned at 100% rates). For the most part, I don't think the rates of learning most spells are particularly bad - just the chances of primal ones are absolutely horrendous.
I wouldn't compare it to doing job quests and getting the skill automatically. I'd compare it to ARR and HW's requirement of needing to level up a completely different class to learn a skill. Although it's not RNG, it still required a lot of time and effort to get something that would legitimately help make classes actually playable (because let's face it, invigorate was 100% required to play any melee in ARR at least and you lost so much DPS if you didn't have Blood for Blood, either and getting lancer to 34 was an actual chore). Yes, there were parties absolutely excluding players for not having skills, mainly because how necessary they actually were. If the past demonstrates a behavior the community is willing to abide by, you don't dismiss it for another case where you willfully present the same issue. That's called folly.
Again, this clashes with how people will define the job - you could make the learn rates 100%, but then what keeps you from stuffing them in a job quest to go defeat X monster and learning it that way? You know, the same way you learned Water Cannon. Quistis did learn Blue Magic uniquely. She learned them exclusively through items. Such a system could be mimic'd here in XIV thanks to the Walaqee Totems, but I doubt that would have been satisfying and agree with BLU fans. I still stand by this particular statement, though, especially seeing we have another job that often gets criticized for its implementation, despite being a fully functioning one.