We would like to do Windows eventually, but it's not a priority at the moment. "
Additionally and unlike Mozilla, this volunteer community is also very unlikely to care about non-enthusiasts who may complain the browser doesn't support Encrypted Media Extensions (EME), Web Environment Integrity (WEI) or whatever anti-features ad-tech companies are trying to force onto mainstream users. This volunteer community is also unlikely to care too much about whether web sites containing 10MB of obfuscated JavaScript that was developed and tested solely against Chromium-based browsers works well. I think you'd find that the community would rather spend time working on projects such as yt-dlp to just re-implement front-ends for horribly broken websites, or would simply prefer to use non-broken alternative websites.
Linux is also the easiest kernel to develop against too for reasons that include _much_ better sandboxing features being available, better debugging tools and availability of source code to learn from and debug with. Contrast to Windows with undocumented or poorly documented kernel and other system library APIs, lack of source code (particularly examples of APIs being used in other software), and having to do more work to opt-in to security features that are enabled by default on a Linux system.
Or I need PowerPoint and Affinity on Linux.
Tried dual boot for some time, found it too cumbersome.
Yes, it's called WSLg. Uses Wayland, so many apps are a bit messed up. I think there's a way to install X11. Last time I tried it over a year ago it was a bit rough.