I haven’t seen the technique below mentioned anywhere, but I think it’s an exciting way to make sense of Sonoma widgets.
After you install Sonoma, you’ll probably notice a disturbing change in the default behavior—clicking on an open area of the desktop pushes all open windows off the screen (previously, it simply foregrounded the Finder). So, one of the first things you’ll probably do is change that back by changing the option System Setting>Desktop & Dock>Desktop &Stage Manager> ’Click wallpaper to reveal desktop’ to ‘Only in Stage Manager’. The default version of that option (‘Always’) pulls back the windows to reveal the widgets hidden behind them. Of course, if you haven’t defined any widgets, it’s pretty useless.
So, on an empty desktop, go ahead and select some desktop widgets and place them around the desktop. You’ll notice that if you have any objects on the desktop, the widgets will push them around. Once you open some windows over them, the screen becomes pretty ugly, with widgets peeking out behind windows. However, you can clean this up by going to System Setting>Desktop & Dock>Widgets and deselecting ‘Show Widgets on Desktop’. At the same time, change your setting in the ‘Click Wallpaper’ setting back to ‘Always’.
Now, in normal operation, your desktop appears as before. But, if you tap the wallpaper, the widget layer is revealed. This is much like the old Dashboard operation where tapping an appropriate function (or keyboard shortcut) would have a Dashboard widget layer overlay your desktop. It’s not quite the same, but it’s close. If you’re in the widget desktop, wallpaper now returns your windows, hides the widgets, and leaves the Finder as the foreground app.