This issue easily makes top 10 Windows annoyances. Microsoft will just add more ads and AI instead of solving these fundamental issues. My other issue is making virtual desktops different (names, colors) to easily recognize them.
Windows 10
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KDE Plasma has this problem as well. I think GNOME actually solved it by displaying a notification once a launched application is ready. Not sure if applications can still force themselves to be in front though.
The old TweakUI (Microsoft Windows PowerToys) had an option to disable focus stealing. I doubt if works on current versions of Windows though.
There's Always on top power toy that might help.
I see conflicting reports of it losing focus.
While I don't have a solution for what you're asking, my workaround was to make a script that opens every program I want on startup. Then I just boot my computer log in, then walk away for a few minutes while that i9 churns away.
I would be curious if there's a way to override that though. That and windows that open in the background (for no reason) drive me insane. I'd at least like it to be consistent.
That's not a bad idea for most at-work stations, but I frequently switch around throughout the day. That does give me the idea to have some specific apps open with a minimized argument (via batch file or shortcut arguments), but that only solves a fraction of my problem.