Linux has Electron compatibility already. On desktop there is no good reason to worry about "native" control performance.
And considering that React Native can barely seem to keep the controls in sync on iOS and Android [0], trying to throw in a tiny minority platform like Gnome makes no sense at all. Better to build controls for raw X or even an OpenGL UI implementation. It's not like it's impossible to do the latter. [1]
In fact, VS Code already runs mostly everywhere, has gotten a huge amount of community mindshare in an amazingly short period of time, and at this point I couldn't imagine ever using gedit for...well, anything, really. Why would I?
P.S. Not a downvoter.
[0] A friend is working on a project that's run into a number of "bug on Android, not on iOS" that, once patched, became a "bug on iOS and not on Android" issue. Rinse and repeat.