You're nit-picking the use of the word utility. My point is having a raid buff shouldn't result in a tax on your total damage output because it is part of your damage output - it will definitely lower personal dps though. I don't play Ninja nor do I know why SE balances the way they do. Going by fflogs it looks like Ninja was top in ShB and even in EW it's not far from the top at all, what's the problem? All the melee look very close right now, Ninja isn't being taxed hard.
As for SMN's healing:
https://www.fflogs.com/reports/f3PbV...aling&source=7 is one example - 26% overhealing on Everlasting Flight, not bad at all for a hot. Just pick a boss select Summoner and sort by healing for more examples. I haven't been raiding with SMN so I can't speak on boss dmg timings with Phoenix but it's definitely not as useless as people make it out to be.
Magick Barrier doesn't actually heal, its reliant on healers to make use of its utility while SMN is not - Magick Barrier should actually buff SMN's healing.
SMN's heals are absolutely free, you don't choose between an attack or a heal you do both and Phoenix's potencies were buffed so it's overall stronger than Bahamut despite having 1 less attack.