The 7075 seamless tube has several advantages over these materials, a reason why you find the material in a wide range of industrial applications. Look at an element such as the strength-to-weight ratio. The 7075 aluminum extrusion is better than the alternatives in this respect, so users have it in projects where a blend of strength and low weight is necessary. The versatility of the 7075 aluminum tubes is something else that is not common or as good in alternative materials. Versatility is present in the sense that the capability to form and machine these tubes is high.  Add that to the high corrosion resistance the 7075 material exhibits and you will understand why not many alternative materials are more suitable.