There's no 'burden of proof' here.

If you want players to be able to make up their own minds about the data set, you need transparency. It's very easy to present information in a way that is manipulative, simply because not everyone has a background in mathematics. If I can see dps contributions under Arcane Circle by job organized by percentile, I can see which jobs synergize best with me. I can also see if there's a significant discrepancy in those values that needs to be addressed. The same is true for all buffs, be it Mug, Embolden, Litany, Battle Voice, or whatever. You don't even need to make the distinction for 'single target' vs. 'raid-wide' buffs, it's useful information around which we can have an honest discussion. You don't have the same transparency with a back-of-the-envelope aDPS estimate because you don't know what smorgasbord of buffs were on offer even as a population average, and we can't tell if we're actually looking at contributions just from two minute buffs or random party wide BRD songs that are also thrown into the mix at random. The data is already all there, it's just not tabulated the way rDPS/aDPS/nDPS is. I don't think the issue is time investment. People just need to express an interest in it.

rDPS isn't a proxy, by the way. It's just the original raw DPS numbers reallocated, with no damage discarded. And it is a relatively robust parameter based off how it's calculated.