You're constraining yourself to a language for no good reason. With your logic, we'd all be writing C. Communicating with ytdl from any other language via a library or even a process call is rather trivial so just it being written in python is already a non reason.
I chose js a la electron because I needed a nice gui I could style and add user friendly interactions with minimal work to amongst several other reasons, the aim was to have a nice way to browse my archive and track what goes in, not create new work. If I just wanted videos I could easily have done this with a script, a browser extension or any of the zillion ytdl variants available. By just scaffolding a new project I had already met a lot of requirements, easily embeddable iframes, no external video player, instant search (fusejs) and the list goes on. This is also my first electron project and first time using it so go figure, heh.
Also funnily enough the first quick draft of this was in python using qt and lived in my taskbar tray which served a simple html page and ran in the background but it wasn't fun to use and required a lot more work rather than just mindlessly pulling down packages to use in a fun side project.