I agree that it was a tough decision but our users gave feedback that with vertical navigation they had to do a lot of scrolling and since they compare performa

I agree that it was a tough decision but our users gave feedback that with vertical navigation they had to do a lot of scrolling and since they compare performance on conversion goals, it is a lot of back and forth with navigation. With horizontal navigation, there is no need to do scrolling. I think we may give an option to switch between vertical or horizontal navigation. It should be easy feature to build.