For me, Parsec can handle much better big FPS fluctuation. Even with Power Upgrade on 1080p you can have always solid 60 FPS all the time. Currently shadow will disconnect you, when you are not connected via the App. As far as i know, for Shadow VR there is a Exception. You can use Virtual Desktop without the Shadow Streamer. It would be really nice to have official Parsec support.
I made two videos about how parsec is running on Shadow PC with W11.