And they hate it. Patreon, too (particularly the ones with more risqué work). A dedicated platform would be a major boon in terms of community, reliability, and possibly remuneration.

I'd argue Patreon is dedicated enough.

If we're talking about remuneration, the audience/customer don't really want a "dedicated platform" since that's not the only thing they do, unlike the artists themselves. Or in other words, dedicated platform (like deviantart) is fine but it won't attract the largest audience.