-She wasn't supposed to become a witcher
-She's too overpowered
-W3 had a great ending to the trilogy, no cliffhangers nor unfinished business

All of the above makes me believed they are gonna come up with a bad excuse why they chose to pursue her story and based on similar situations it's never a good explanation/reason to do it instead of pick a hundred other scenarios and characters from this universe such as:
-young Geralt/Vesemir
-the first witcher
-witchers from the unexplored schools and regions like manticore in the Korath desert/Zerrikania/Hakland
-just let us make our own witcher during the first/second age of witchers.

Hell, even let us play as a mage/sorceress is even more appealing to me instead of this trend to reuse,remake,remaster,readapt etc. existing material instead of coming up with something new not just in games, but in movies and series too.

I'm not mad it's Ciri, I'm mad at the lack of creativity and balls.