Like most things it depends. Stunt and combat models have low wing loadings for the size by RC standards. Speed models and speed related models tend to have any where from high to hellishly high wing loading. But then so do RC models intended purely for speed.

Purposely higher? No, not really. It was just that to keep the models flying fast enough to keep them at the end of the lines that early models tended to be overpowered by RC standards back then. Hence the old "brick on a string" comparison made by RC modelers back then. But these days the situation is pretty much reversed. Where a single or two channel model of around 56 inch span used to be built light and powered by a .15 these days such a model is considered as barely adequate with a .40. So the old distinctions have pretty much faded and when comparing stunt and combat models the wing loadings and power loadings are pretty much equal.