Smart choice using PixiJS for the rendering pipeline — WebGL gives you hardware-accelerated compositing for the zoom/pan effects without needing to shell out to ffmpeg for every preview frame. The auto-zoom feature alone makes this worth it for anyone doing quick product demos where you'd otherwise spend 20 minutes keyframing in a full NLE. Would love to see cursor click highlighting land at some point, that's the one Screen Studio feature I actually miss.
pixijs has been great for my saas as well. rendering is blazing fast compared to ffmpeg pipelines.
Same, only praises; I used pixijs 10 years ago in a resource constrained mobile focused project and I keep using it today.