Ask HN: What would you like to see in a modern GUI toolkit?

Having played with both GTK and QT I've found most desktop GUI toolkits unpleasant. I can see why a lot of devs end up using tools like electron, while the javascript stack has it's problems on the whole I'd say that it's easier to get started building a UI using that tooling then trying to build a new gnome app.

So if there was a new GUI toolkit, something that could compete with electron and GTK, what could it look like?