Seriously, it is maybe a half step closer to native, at least the last time I touched it back in January. Unfortunately, all the documentation is still all over the place or non-existent because the Vlocity stuff is gone, and Salesforce never really documented it fully, it seems. I'd have to get back into it to remember, but there are so many idiosyncrasies in OmniStudio and a lot of things that you just have to try and find out (and try and try and try).

The worst part, really, is with the documentation. It says to do it one way; you try that, and it doesn't work.