There is an entire spectrum between "640k ought to be enough for anybody" and "this app needs its own fully independent copy of an entire browser engine just to display a couple screens of text".
About Electron: Operating systems provide their own system-level webviews. Use those. Tauri uses those; Tauri apps are absolutely tiny and use very little RAM, because the system-level webview doesn't have to duplicate the overhead of an entire browser engine for every single app that uses it. It typically only has to duplicate the overhead of a single page.
But that is for apps that even need a webview. For apps that don't, you don't have to drop all the way down to assembly to pick something like WinForms. Even WinUI 3 isn't always terrible, at least compared to webviews.
Hell, I wonder if even Python + wxPython would be more efficient than using a webview. Honestly, none of the software you mentioned is "too wasteful", or at least those aren't what I was referring to with my original comment.
Have you heard about Microsoft Teams, and how it can take up to 10 seconds just to display the splash screen, even on a decently fast computer? I'd like to see you try to tell me that it would have literally killed them to optimize it a bit more. Just think back to, say, the IRC clients from back in the Windows 7 days where you wouldn't even have to blink before they finished opening up.