I guess, different strokes for different folks. I just like colors in ACR better than in OW, find them more detailed and more natural. briefly tried C1, but also didn't care.
I used the old Olympus Master software though back in day in 2012 and was satisfied. when I got my first Pen in 2011, I liked the colors, the contrast and the whole in-camera JPEG engine. then the love faded away, I even got a Canon for other opinion on how it all should look. and now back to Olympus, but still dislike vendor's rendering. I actually recall that back in day ACR was bad as you're describing (and it's still bad with my Canon) and I actually was surprised that it gives me good results with my new Olympus.
it's great we have lots of software to choose from for different taste. I know, Affinity Photo's RAW engine is young and not sub-par yet, but just dreaming in feature requests forum that someday it would be better.