Since the devs clearly see the forum as stated in Beta Previews, the one thing that would put SynthV as the king of the hill is the implementaiton of SynthV2 as a Playback Engine to work along Notation Software. Many of us have seen Cantai and its progress. I can’t deny it looks promissing nowadays, but SynthV is honestly better as it has various features that took years to develop and implement, but made it into a polished product (Rendering speed, multi language support, different voices and choirs, a vast amount of settings for expression and ornamets, etc).
I am 100% they are already working on this behind the scenes. When they launched ARA Support, Avid did the announcement for Pro Tools compatibility on their socials. So i imagine development for Sibelius compatibility and other notation programs is on the run. If they make it, oh boy, it’s gonna be good.