Because many of UI redesigns I have witnessed with tools and sites I spend a lot of time on were for the worse. Somehow it being done by UX professionals is not

Because many of UI redesigns I have witnessed with tools and sites I spend a lot of time on were for the worse. Somehow it being done by UX professionals is not a guarantee that I, as a user, would benefit from it. I can't begin to guess what the motivations were, I just know the results.