While I generally agree with your skeptical attitude toward this, I think the fact that they were targeting Apple's Metal graphics API to built the most performant possible IDE makes sense. You can't just snap your fingers and have a Linux graphical stack start working with your software.

I think the reason they targeted macOS first is probably because many of the dev team uses Macs.

As a Linux user, I'll happily wait for software like this to get ported to native Linux APIs so we get performant text editors instead of more Electron crap.