I'm scared away from HTML/Electron as it seems (perhaps I'm wrong) that means I am going to have to also use Photoshop (which I'm particularly bad at) and design literally every bit of the UI from scratch while what I want is a set of classic widgets to layout on a form quickly (the way I do in VisualStudio and Qt Designer). I have experience of using HTML, CSS and vanilla JS to make classic web pages and I can't even imagine how to html/css-code something that is going to look and work like a reasonably complex desktop application. Also as @mherrmann has once mentioned "Do you know how JavaScript sorts numbers? Alphabetically. ’nuff said.". At least but not at last Electron apps are so slow to start and so hardware-hungry I actually doubt it is going to become a truly mainstream platform for desktop applications.

BTW the technology doesn't look flawed any more (arguably it is less flawed) than WinForms is. If only Trolltech would consider developing a WinForms-style (or call it Delphi-style) RAD studio (that would provide click-to-code experience, a visual BackgroundWorker component etc and let you customize everything visually instead of only doing the actual form design job like Qt Designer) a worthy investment PyQt5 apps development could be made a breeze.