I found out which game has that system - it's The Witcher 3.
I figured that was a very nice feature to have, and would limit the sale capabilities too.
Eventing is where I struggle the most because I haven't learned enough about it yet, so I'm trying to do everything else first, and study eventing in the meantime, and then tackle it head first.
Game making sure is an experience. And if you don't end up learning A LOT of different branches of GameDev, then you're doing it wrong. xD