Ubuntu tried this - how'd that go?
Second issue is: how do I use it? How can I install it on MY devices?
I'm all for privacy and I want to is it, just seems like a dream and it will never come to fruition
It solves a _development_ problem, in that it reduces the amount of work needed to allow an application to reach a larger number of devices. Basically the same reason for things like React Native and PWAs.
> Ubuntu tried this - how'd that go?
So because someone else failed at solving a particular problem in a particular way previously, we should simply give up on it?
That's great for developers, but how does that help users? As a user, I would rather use something built specifically for the device (and os) I'm using, I've used enough things that were supposed to work everywhere that it's a major turn off at this point.
If developers want to share code cross platform, really, the way to do it is write a shared core logic (probably in C, because that is available everywhere), and then write the UI from scratch everywhere, conforming to the platform guidelines (unless it's a media player). It's more work than hoping a write once run eveywhere will work well, but it delivers a much better result.