I agree with you regarding their maps and products. I stopped using google maps here in these area because of all the inaccuracies, but at the same time the UI/UX of Yandex is horrible. I do not understand why they could not create better product with better UX. It's so frustrating to use their product and it's such a shame how they manage their team based on what you're telling me. I've been told by current CS/infomratic students here that, Yandex school teaches their student a lot about heavy math CS concepts instead of a specific language.