It's a touchy subject for sure, unfortunately even if SAM were to balanced around having utility, it's very well possible that sam will still not be better than the other 3 options or at least strong enough to warrant taking. I think the mentality is more so the issue rather than the jobs themselves when talking about melee. NIN is so weak in personal dps that trick attack keeps it relevant for the most part and it's enmity tools help too. DRG is the most oppressive because of how free disembowel is as raid utility for ranged dps. I don't think there will ever be a way to balance melee simply because there are 4 of them so the only reasonable solution is for the dev team to either handle jobs with a meta rotation in mind so that all jobs get the chance to be relevant; A set rotation of sorts or, just keep doing what they're doing and hope SAM gets lucky.

SAM and MNK have the misfortune of watching NIN and DRG dominate the raid scene for almost 2 years now, nin has always been meta so i think it's time that other jobs get some new tools to make nin less dominant.