Starting this discussion with MSQ roulette specifically is why your position is misguided. If "MSQ roulette" involved actually replaying selections from the bulk of MSQ, it would be "insanely fun." But that is not what MSQ roulette is.
Also, I have already commented elsewhere that the MSQ roulette problem (and by extension other grindy things you listed) is due to XIV having a system that over-incentivizes/requires leveling jobs as opposed to giving players other, self-saken rewards for repeating content.
Personally, I think that now multiclassing is no longer a thing, the job-specific experience system should be abandoned. I'm not against having some kind of progression system in "leveling up jobs," but it should be much shorter and quest-driven to obtain more abilities, not a leveling grind.