I would like to offer http://openstreetmap.org as a counter example, where the best editing app is made in Java and the most used one is Javascript. There have been QT4 editors but they have never gained traction, I never found the problem to be performance between native and Java.

I think Javas problem was it's Unix engineering roots, with too little focus on UI, and perhaps a little too much of the "we don't care about performance"-mindshare. The latter being the only problem I see with some electron apps.