However, I understand that said apps may have not existed without Electron at all.
And especially, for jitsi, I think it makes perfect sense. If you are going to create an app that does video, audio and web rtc, it would be silly not to use a battle tested browser engine that does all this already.
Besides, having contemplated the state of UI in a world were you have a bazillions of combination of hardware type + screen format + OS kernel + OS version, I have to say Electron doesn't have much competition.
What are you going to do? QT? Phone support is abysmal and it's a pain to package. Kivy? Super slow, almost no widgets. Flutter ? Uses a niche language with a very small ecosystem and an unknown life expectancy.
I probably would go with the later, but I can't blame people for taking the easy road.