No "they", just me. And there's a reason why literally no sandbox RPG on earth - including AAA games - do this. The sheer number of variables that need to be accounted for are staggering and you'd spend 30 minutes just clicking on "did you do X, Y or Z" options.
Also, why do you need a skip button? Saves are all compatible and pass into new versions automatically. There's no reason to restart unless you want to, and if you want to then why are you skipping?
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As Arc said making an option in the game to skip to a certain point would be too complicated because of the sheer amount of different things you can do
If what you mean though is a way to load back to where you were before, there are saves.
Just save the game before closing and load your save when opening the game again, it's not that hard.
Just don't delete the old file before opening the newly updated game, that way you insure your saves being preserved.
I'm sorry for your loss ;P
If you head over to the CK Discord, people there would be very happy to share their save files with you.