Talking about the vid that was linked, from the discussions its clear you favour the book characters and their specific reasons and more power to you. I view the situation from the games itself not the books. Since we are at an impass there is nothing left to discuss.
Again you prefer Yen good for you, just not all of us do. Or is my subjective statement have to be analysed as well?
From the game Geralt has to deal with consequences due to Yennefer's actions. Steal a mask, nearly nuke an island, destroy sacred grounds etc. I personally find People who make rash decisions without considering the consequences annoying and therefore Yen falls into the category.
Sure some like that she snaps but only because geralt is a lowly witcher, all her wit and personality go away in front of the emperor. In end i find her obnoxious. When Geralts brothers, Vesemir and his friends all point out she is toxic then it has to be considered. If something is toxic, feels toxic, everyone says its toxic then no matter how you sugarcoat it its toxic.