1. Massive download for a simple app. 37M is a lot of data. 2. Massive download for every simple app. It would go a long way if every electron app didn't have pull in a full 37M, and could share a set of common libraries. n*37M is a lot of data, and this is one strong reason I like this Signal Desktop release. 3. Battery unfriendliness. Even when idle, every Electron app does a lot under the hood that isn't even related to the app itself. This is the cruft of having a full web browser and an advanced JS VM, but it is a cruft regardless, and it is very disheartening when reduces a ten hour battery life to six hours.
Qt these days needs at minimum 30MB for a simple window and that's a huge overhead for basically a hello-qt app.
But Qt isn't as bloated as carrying around another browser.