I... honestly don't much care who ends up having indirect contribution, or how much so. I just despise raid buffs that aren't significant enough to influence gameplay or even make anything appear stronger in the moment, only the final number tallies.

It makes more sense to me that whoever plays around a position most able to split its attention onto other members and move to and around them as would be helpful should be the one with the most strength allocated to indirect means. Beyond that... whatever.

I certainly don't feel like such typal distinctions are necessary for job identity. On average, I find it at least as likely that they'd conflict with individual job identities.