Yeah, the RNG is quite horrendous. Ironically, in the content that requires a party to do (Dungeons/Trials).

It is neither accurate to how it worked in previous games, nor does it promote that same feeling that makes people want to go back after finishing the game and learn all of the abilities.

Further to this, several of BLU's key spells are actually ones from these massively RNG Dungeons/Trials, in addition to some of their job quests (For example, I'm still stuck on the level 20 job quest, because I can't learn Mind Blast no matter how many times I seem to run through Tam-Tara)

Like, honestly, they really needed to pick one angle to go with on this. If they wanted to have RNG heavy skills to learn, make them pure fluff ones that no-one needs to be effective so you can at least play the job properly while you farm for them (Also, don't make them required for the job quests and make them solo friendly). If they wanted to put some in duties, don't make them RNG so you have to keep spamming this party content over and over.

Don't mix together all of the worst parts of forcing the content together. Making RNG heavy skills, required for the class to play optimally and to advance job quests, while putting them firmly inside group content so they're inaccesible to solo players or players who might start playing the game later when BLU hype has faded and no-one is putting together parties to go farm the required content (Notably EX trials... I mean, eventually all the dungeons, even the level 50 hard modes, will be soloable. The EX trials... Not so much, especially Titan)