PWAs would be cheaper to develop overall than building 2-3 separate code bases. Which would mean more software available generally, particularly from bootstrapped companies.
I don't think anyone is suggesting that native go away.
But that's my point: that's exactly the promise of every single cross-platform system out there. But in my experience, that's generally not true for non-trivial apps (ever heard "write once, debug everywhere"?). And second, it usually makes for worse UX on all platforms.
I feel like many people consider PWAs as a totally new thing, but at the end of the day, it's a cross-platform system. There are tons of those; just look around, cross-platform is not a silver bullet.
Every non web cross platform system doesn't have nearly the investment as browsers do for quality and compatibility. It's not even close. Like, orders of magnitude. I don't like the cross platform toolkits either.
Let's not pretend the web as a platform is the same m'kay? People use it every day from all of these devices, like billions of people. This isn't some unknown, where this speculation is reasonable either. There are issues, but it's not equivalent.
Then you should support PWA as an alternative. It's lighter weight, both lower memory and download size, compared to electron.