It’s not really JavaScript, I’d argue it’s a different reason.

node-webkit apps are cheaper to develop. Far cheaper.

Everyone can write a webapp, a native application requires professional developers. The payroll looks completely different.

And then the devs who have only worked with node-webkit don’t know how much better they could have it. I know devs who refuse to use map, reduce and filter, because "it’s black magic and we always used for".