I get that tradeoff, and I can see how it makes sense for apps that don't interface that much with the OS/UI they run on (although I'm still not a fan of the resource usage and the occasional UI yankiness).
But for a terminal emulator? These are pretty deeply integrated with the OS they run on and often run with elevated permissions and/or get to pass through passwords as they're entered! I can't imagine using one written in Electron.