Why would you not want a toolkit that makes rich application experiences across multiple platforms easy and standard?
I get that performance is a problem with the tooling in its current form (arguably...) but that's not a reason to ignore the problem electron is solving: creating complex UIs using things like WinForms, QT, GTK, Cocoa, etc SUCKS.
It requires learning vendor specific toolchains, different builds for different platforms, and an incredible amount of wasted time that could be spent developing your business logic instead.