> Electron is incredibly wasteful. If a web interface is absolutely necessary, please just serve it on localhost and let me use my existing browser.

I know of a couple that does something like this.

FSBox for programming SFPs install a driver and a runnable tray software, you configure it through your web browser.

SolarWinds backup, installs a tray but opens a web browser to 127.0.0.1:5000

Syncthing runs a local webserver too

As you're saying, I wish more would support this way, I don't want someone's outdated browser when it can be a tab in my Firefox