About 8 years ago now I ditched .NET, Java (Android), and Objective-C (iOS) to JS in frontend and backend with NodeJS and PWAs and couldn’t be happier for a dev perspective.
All frontend is just one code. Sure, you have to manage browsers compatibility, but it’s not a major issue. Mobile users and desktop use the same application. I didn’t know Firefox dropped PWA on Desktop, though most of my desktop users were using Edge or Chrome. I can only think of one client that used Firefox and it worked fine, except for Firefox has some out of spec EventSource bugs. Safari has gotten better (especially after 16.4) now where I would Firefox as the leading source of browser issues when developing. Also, Safari 17 looks to finally treat PWAs with some legitimacy. We even have Push notifications now!
I don’t understand Firefox’s decision, but Firefox on Android still supports PWAs on Android. But if they no longer care about desktop PWAs then I’ll give Firefox less importance for desktop environments. Probably doesn’t mean much in testing, but that means if I find a Firefox exclusive bug related to desktop (eg: mouse), I might just ignore it.
I would highly recommend PWA over Electron. There’s nothing better than getting clients to transition to your software from a competitor with just a simple PWA with no install. I also support as far back as Chrome 88, which means any EOL ChromeOS device is still supported.
You might need newer APIs depending on usage, but I haven’t found anything that I need to tap into some sort of native runtime for core usage. Maybe WebRTC runs better on newer Chrome, but nothing really requires native code. It’s just easier to maintain one single codebase without locking out potential clients because of OS (desktop or mobile).