I think you have to get used to the fact that each software has a different philosophy and way of organizing displays. Not to mention completely different feature sets. In Blender’s case, they made the choice for this to be an overlay when made globally. Which makes more sense than it being a shading option. Wires have nothing to do with shading because they can be visible in all shading modes. By your way of thinking, we would have two options for each shading mode. As it is the option is still right there in the top corner right next to shading options with wording that is real clear as to what it does in the little pop up hints.
In many other software you are very limited in your choice. It is either wireframe, sold, wireframe solid, then textured and lit and so on. That is why they are listed together.
Blender’s way of doing it is different. So in this case it makes complete sense for it to be non obvious since it is a feature. Not a UI decision.