Actually, think of it. If we have to accept Electron apps existing at all, Etcher is precisely the best possible kind of such app. One that you open, make it do its job, and close it. Meanwhile being an HTML UI it allows the creator to focus on the best operation possible and not lose time on UI shenanigans.

For comparison, the worst kind of Electron app in my opinion would be one that you have to keep open at all times, losing all the resources that Electron eats, on a "permanent" way.