I only see these complaints on HN. Real users don't have this complaint. What kind of low-end machines are you running, that Chromium engine is too heavy for you?
> They are often laggy or unresponsive.
That's not due to Electron.
> They don’t integrate well with OS features.
If it is good enough for Microsoft Teams it is probably good enough for most apps. Teams can integrate with microphone, camera, clipboard, file system and so on. What else do you want to integrate with?