Where the Meta/Paradigm Problem Applies

[Risvertasashi]

So I guess I'm asking, is this paradigm/meta problem that we're seeing even an issue outside of Alexander Savage? I know community mindset may be an issue here, but I want to focus on mechanics and group success in the rest of the game,

It's an issue precisely because of the community mindset. It might not matter that a PLD can completely Bismarck Story-difficulty just fine if groups with incompetent DPS decide to kick the PLD.

Generally speaking, outside of the current raid tier it doesn't really matter. This has always been the case. Even in the current raid tier, once you overgear it, it doesn't really matter. But the raiders have the mindset even when overgearing (But to be fair, it's usually just about pushing ourselves to be the very best we can be), and it filters down.

So to recap: In terms of mechanics, no, it's no problem. In terms of group success, minmaxing DPSing tanks and healers help carry DPS even in lesser content, but often success can be found without it. That doesn't mean the meta is not an issue though, as in MMOs, shaming and pariah'ing are very real problems and can making playing a job that is perceived as suboptimal, or playing it in a way that is not accepted, effectively impossible (see also: FFXI).