I think people who like fast front leg kicks, like a side, hook, or non MT roundhouse, feel comfortable in a side stance since these techniques are readily available; however, there are just has many kicks easily ready from a more forward stance and the rear leg techniques are generally more powerful. You can throw a rear leg kick from the side stance (most notably the roundhouse) but you need to open up your hips and shift forward so you are taking yourself out of the side stance for a moment to throw that technique.