Vsync and FPS: what the hell

Does anyone know why vsync is stuck to “on” if not in fullscreen mode? I play in borderless window mode and use a gsync monitor so I always turn vsync off. I think I was able to circumvent this with nvidia inspector by forcing vsync off globally to override the application but I’m wondering if anyone knows if there is an actual reason for this or is it a bug/oversight?

I’m also only getting about 90 FPS (at best) on a 144Hz monitor. I get higher FPS in PUBG which is really strange IMO. I mean PUBG isn’t exactly known for it’s great optimization so that is saying something (pretty bad) about B3. Normally, a game like this would be max FPS for me.