Excalidraw is great. I created a macOS wrapper as well a while back and still went back to creating a web-based alternative instead. ExcalidrawZ looks a lot more fancy than what I had back then.

I switched to web mostly for collaboration. The shared environment on the web somehow makes more sense for collaboration than the challenges of setting up sharing with local apps. You could go with a server in between, but I haven't figured out any upsides really.

What I did do is customise the editor and add a bunch of features that really helped in collaborating the way I like it.

So a bit of a shameless plug: https://kromdraw.com/