Why why would I want to use Go on the integration side, and still have to use JS within the webpage? Most Electron apps I've seen have a slim wrapper of code in their main file to just initialize native things. Why is it better or easier to do that in Go instead of in JS?
This can be useful if, for example, you want to deploy this as a commercial software and do some checking against piracy...
Which leads to: there's still no licence attached to this cool project ;)
Just stop it and give up on DRM.
Probably, you wouldn't. But it's not quite surprising if users of GopherJS and Go would prefer Go over JS, is it?
(Obviously this is a ideological argument rather than a practical one because most projects don't have the budget for devs to do that much prep work like learning a new language, but practicality is boring. :) )