Casters in general are in a pretty terrible spot just because of how oppressively strong physical DPS is, but their balance even against each other is simply all over the place. SMN has most of the utility, has more mobility, nearly matches BLM in personal DPS at higher levels of play, RDM has barely any utility outside of prog and its personal DPS is abysmal, and BLM is strong but suffers from the game simply not being built to support selfish DPS and necessitates thoroughly knowing the fight to optimize positioning.

I don't favor nerfing SMN because SMN sits where EVERY caster should be at, the issue is that BLM and RDM are utterly subpar in an already under-performing category, and I believe that saying SMN is "too strong" poorly frames the argument against summoner rather than in favor of BLM and RDM. In terms of job balance, there has to be a middle ground between casual play and 99th percentile insanity, because while savage content isn't necessarily the primary focus, it IS a part of the game that must be acknowledged and balanced around simply because it exists. Just because all jobs can clear content doesn't mean there aren't clear disparities both in performance and usability, and this needs to be acknowledged in order to further improve the quality of the game.

Or, simply put: unga bunga perfect balance impossible but trying still important.