You can't really debounce it easily due to how the OS event queue work across processes and windows. One fix could be to not bing the focus to newly open windows (like you could in X11) but that's not what users want.
You don't know that until you ask users. That would be a much more useful question than those boring "tour guide on first login" or "please activate cortana/copilot" or "do you want to sync to onedrive" stuff one gets notified on some major desktops.
My preference is focus follow mouse, no focus stealing on new window opening.
The users are trained on their exposure to behavior in Windows, MacOS and non-ancient Linux distros. Good luck changing the expectations of the world population. I believe the GIMP tried that for a few decades.
