@Kyle Gospo Actually I did ask this before on the OBS Discord, I got this from a Linux contributor:
"Under Wayland, PipeWire (xdg-desktop-portal) capture is usually zero-copy with DMA-BUF.
My opinion on vkcapture, is that it has usecases:
Allows better "game" capture on X11
Allow to avoid capturing overlays (e.g. steam) if the vulkan layer are correctly ordered
Transparency for some scenarios like VTubing (until portals support app to app screencast)
The main issue about this plugin, is users always searching for a "Game Capture" source in OBS, where Wayland (same for macOS) provides a good Screen Capture source."