It is hard to get google to not offer Server level software when you search "Desktop management application"
one suggestion I find is this but program is more for multi monitor setups.
It can remember layouts so might be close to what you wanted -
https://www.displayfusion.com/Features/WindowPositionProfiles/
its more for pre set layouts, not random ones.
the remembering unsaved bookmarks? i think most browsers can be set to open on last tabs, that might be as close as you get.
Timelines never expanded past being Microsoft programs. So if you don't have Office and don't use Edge its usefulness was probably not exploited as well as it could have. So I guess that Sets are still on a to do list
I have been waiting since 2015 for multi desktops to be useful and remember what was on them last time. Just open applications would be enough. Windows 11 they added the "ability" for desktop wallpapers to be different... 5 years progress right there... at this rate will it ever be useful?