The outrage is because the web isn't simply a "UI platform". That's only one use of it. It's also a document platform.
Also, arguments of the form of "X is unique, all others are doing the bad thing" are suspicious to me. This would mean we should cherish and preserve X, bringing the good aspect to other platforms, not devolving it into mediocrity or worse.
To be honest, it's a unique property of the web for you to be able to easily read the source; however, users of other platforms such as Qt are not expected to read the source. The web is simply moving in the direction of all other UI platforms, so I don't quite understand the outrage. Yes, it sucks, but it'll make apps faster than the Electron mess we have now.