The biggest reason they are advising their customers to roll back is the same reason they had when they were advising their customers to stay away from Windows 8. They are not up to speed on supplying the required technical support yet. In other words it is easier to support something you are familiar with than something brand new. Just think there are much larger differences between Win 8 and Win 10 than there were between Win 7 and Win 8.
It will come with time.