Web versions don't work with all browsers, they also want you to use the app, and heavily promote using the app, even though the app is just a web page in a browser that's not your browser.
If they want you to use an installed app then they should just build a native app that can be installed.
But what’s stopping you just using the web page (in a browser that it works with)? Yes, they want you to use the app, but you can still do what you want.
There is usually critical missing functionality from the web version (mostly around native filesystem access). Also, most sites that offer an Electron app paster annoying banners advertising this fact across their web version...
If they want you to use an installed app then they should just build a native app that can be installed.