Unfortunately, I don't see OBS's audio changing at all anytime soon. It's a mess under the hood, and to use, and not really maintainable.
The devs know this, and so they're in the process of figuring out what to replace it with, and not try to fix the present mess. That's harder than it seems too, because of so many different uses that all need something different...and they absolutely do NOT have the time and resources to make it do everything natively!
One of the ideas they've mentioned, and I really like, is for OBS proper to be pretty stupid with audio, and have most of what it does in a large plugin instead. Ship a default plugin that does the same as what it does now, so that existing rigs don't break, but expect the community to come up with a zoo of much better ones for different uses.
Until that happens, or whatever they come up with, I would not expect any changes at all in OBS's audio. In the meantime, use an external tool, like a DAW or physical console, to do ALL of your audio work, and feed its result into OBS as its only audio source at all, to pass through completely unchanged.
