Earlier quoted context omitted.
We've had perfectly viably cross platform GUI-applications for decades. Lots of them. Done one way or another, or a third. I'm sorry, I fail to see the problem that abominations like Electron are trying to solve.
Could you demonstrate an alternative that allows for UI as complex, with fewer cross platform issues that can easily target usage on MacOS, Windows and Linux? Let alone leveraging the language and UI interface/api that are the most widely developed against.
The electronisms I occasionally have to use are glorified chat-apps like Signal. Hardly complex UI cases.