Firefox OS never made sense unless Mozilla was prepared to pay the backroom bribes and incentives to get it preinstalled on hundreds of millions of phones. And they weren't.
Maybe maybe not. But it's also good to keep in mind who else failed in that space from many different angles. MS, Nokia, Blackberry, etc... If MS with infinite cash on hand could not get into that market then it is likely that chances of success were always very low. And it still might have been the right thing to try despite the chance being low.
You are right that it was a very difficult endeavor.
I think the main bottleneck is not the installation by the vendors, but the apps available.
I believe, what is missing is an abstraction layer between the apps and the OS. If it was possible to create apps for Android and Apple in a generic way and, it was easy to add a third OS, so all the apps could be made available to the new system, a new OS would be not so limited. I know, I know, that is itself a very difficult endeavor.
correct me but those features are denied by apple and mozilla for very good reasons (privacy and security) besides beeing anything but 'basic' (midi anyone?)
PWA's do work, but they are hard to install (not available in the appstore, the user has to go through a non-obvious sequence of steps they won't discover unless they Google it). They are slow (because safari refuses to implement caching of compiled JavaScript or webassembly). They can't store persistent data, so the user experience is terrible (yay - who wants a notekeeping app that deletes all your notes every 30 days?). The data doesn't sync to iCloud. It doesn't integrate with the rest of the OS (no way to share a picture to a PWA for example). The Safari browser engine they must run in is ~3 years behind desktop and Android browsers with supporting web standards. There is no way to do background stuff like playing music, using the GPS for directions, etc.
If you're scared of something, sometimes it's best to invent it and then not invest in it than to let someone else invent it and do a decent job of it.
Classic example: Oil companies "investing" in clean tech in the 90's, sucking up government grants and public attention and never really getting anywhere probably slowed down the switch to renewables by 10+ years.
> And it still might have been the right thing to try despite the chance being low.
This is exactly my take on it.
I think timing was a big part of it, too. They were too late to get a foothold on the current market, but too early to take advantage of the more open platforms coming out nowadays like the PinePhone.