What were your (main) problems with Kodi? AFAIK it is written in C++ with Python plugins. Electron would be (on the face) a downgrade yes. But how is a Lua app much smoother?

(My personal pet peeve is that Kodi still doesn't know how to minimize CPU consumption when one is doing nothing on the UI. It should just stop rendering. This means I have to turn Kodi off on my HTPC+server setup to stop it from pushing my CPU in a higher power consumption mode.)