It is easy to scoff at this question when you first read it. Yet, there has been a fair share of users who have asked this question and it seems like it is on the mind of buyers. Ironically, this question actually explains one of the advantages that window tinting has over applying shades. If you apply them to your windows, you are not going to be able to roll the window down. At least, not all the way as you can only go until the fabric begins to resist.
In fact, you may end up damaging the material if you attempt to do so. If this is going to be a serious issue for you, then you may need to look into window tinting as you can roll your window down seamlessly.