They are superficial buffs to make you feel like you're buffing the group when they're really just their to offset your own low DPS. Red Mage's Vercure and Raising capabilities are a much better example of what support and utility is. Dancer and Bard's "DPS" songs and dances are not. Monk's Mantra ability is. I miss NIN's aggro tools a bit. They were fun. Trick Attack's effect is not.
These DPS-focused "support" and "utility" skills are boring and just keep the jobs feeling like DPS bots performing a rotation ad nauseum. I main and prefer DPS classes and don't understand why they can't give them 1 or 2 more hybrid-style abilities, or why they undertune the ones that do have them already. That way SE don't have to worry so much about a DPS job being able to do too much and nerfing a job's performance, because everyone will have their own unique tools (nothing drastic). It's kind of hard for me to explain it.
It's kind of the same issue I had back in HW when there were fewer movement skills to use with jobs. They were FUN and we needed more of them, and now that we do have more of them, lo and behold it feels great! No DPS having a skill like Vercure was also something I felt lacking in HW, people cried "OP!" at the suggestion on these forums (people here are so unopen to these ideas I swear), and then once again they added it when they brought Red Mage on board and it's been GREAT.
THIS is why I think they need to focus more on this kind of support/utility. Rather than just "muh deeps in savage!", I don't just want to play a role I want to play a job. I main a job because I love that particular class. I don't want to job-hop all the time. There's a lot more content than endgame raids. Let the jobs do more. Otherwise what's the point of even having a job system?
Even BLU could have been a normal job in the game with minimal sacrifices if they allowed jobs to be more varied to begin with. White Wind could've soaked half your MP to cast. Make bosses immune to death. Adjust their Kamikaze combo. Etc.
They just didn't want to make their jobs a little harder despite how much money this game makes. And they continue balancing these things anyway so that point is kind of moot.
ANYWAY. I needed to get this off my chest because it's the only thing that annoys the hell out of me in this game after so many years of playing. I don't care if you disagree.