> it's a no-brainer to choose JS for just about any complex UI

Javascript? Sure. Electron? Maybe not. Show me an Electron app with load times that aren't measured in seconds. Or an Electron-based text editor that doesn't choke on a moderately sized text file. VS Code is currently taking half a gig of ram on my notebook with three text files open...

I happen to quite like VS Code, but to claim that Electron is a no-brainer is simply false. There are serious tradeoffs.