Without you were a music major in college, you probably have never had guitar scales explained to you. As soon as you start playing guitar, you usually learn a blues scale , because that is fundamental to most rock music, but other than that, you may have no idea what other functions are.
There are numerous types of scales that you can and should be practicing regularly, whether you are a country guitarist or a rock god. You need to know these scales inside and out if you are to ever become a soloist. That does not mean that you actually have to understand the theory behind the scales, but you do need the guitar scales explained as well as know how and when to use them in your playing.
If all you want to do is play basic rock or blues music, then you really do not need that much music theory. This is an extremely basic type of music, although by having guitar scales explained, you can really do some different things that you otherwise might not even try.
In fact, if you plan on doing a lot of solo work, or if you regularly jam with new musicians, then you should be working on all sorts of scales. They will help you be able to become more fluid on all of your strings, up and down the fret board, and they will enable you to play different types of music with ease. They mays seem boring at first, but there are fun ways to learn your scales, and the more you practice them, the more they will become ingrained into your memory and your performances. After a while, you will forget that you are even playing them, and you will be soloing with the best of them.