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You answered your own question.

You can write a pretty and functional Electron app in a weekend.

To implement the same level of functionality and prettiness in a native app toolkit like Qt is at least a month of work.

It's the same story as Python versus C, or C versus Assembly.

When C was introduced, the old-timers had the same complains like we do today: why would you program in such a slow and inefficient language? Real programmers (TM) use Assembly, C is for lazy people who don't want to learn and who don't care about the awful resource wasting. 3 KB for a hello world? That's an absolutely ridiculous level of bloat.