

I haven’t noticed any major issues with Webkit on my Mac, only that Safari’s UI sucks.
Unfortunately Gnome Web also inherits most of Safari’s bad UI design. Really the only thing I want from Gnome Web (apart from performance improvements) is to have a bookmarks bars like Chromium and Firefox. Having to go into the bookmarks side bar is a major slowdown. I’ve had to work around it by using a keyboard shortcut for a new tab, typing in the bookmark name, then using arrow keys to navigate to it.
Safari has PWAs. They call it “Add to Dock”. Works well in my experience.