The browser is an extremely poor medium to deliver applications. It works, but barely, is a huge resource hog, fragile and it breaks way too often due to a lack of backwards compatibility between browser versions of the same manufacturer. I have a small app that I support and it's been fun to get it to work in the browser (instant cross platform support was indeed the driver) but the experience is still sub-par compared to what I could do on a local application.
this does not track with my experience, so possibly it's the nature of your app or the way it's coded. frameworks like react are notoriously crap. stick to pure html5/css/js and it can be extremely fast and light.
Unfortunately, I think all these things are externalities - or at least, areas that don't impact revenue enough to get companies to change.
I too wish that software would be efficient, robust and long-lasting. But it seems that most people don't care about this enough (compared to other factors) to force change. (Alternatively, they are locked in to platforms they don't like to use.)