I'm sure there's worse hiding beneath the covers of some apps you use on a regular basis; e.g. Teams, Office, most AA/AAA games, etc. While Electron is far from optimal, just because a great app is built on top of it doesn't make that app any less great.
As an example, although I do have a prejudice against Electron based apps myself, that doesn't prevent me from using VSCode, which itself is based on Electron. VSCode is pretty great, and I'm not going to not use it simply because it uses Electron.
They already are – there's a system webview on Windows and macOS. There are a few "Electron alternatives" that use the system webview instead of bundling a copy of Chromium. Tauri [0] is one of them, built around Rust, and it's pretty great. I built a video editor with it.
The usual complaint against this is that you have to support multiple browsers (Edge/Chromium on Windows, Safari on Mac).
Are those services or just shared libraries? I would imagine, although I'm not sure this is the case, that 50 tabs in a browser consume fewer resources than 50 individual WebViews.