When they are using the cushions for position--after speed, and maybe also using follow/draw to affect the tangent line deviation.
However, I mostly agree, because I don't think most 'beginners' have any idea what the sidespin is for. Like, they think it helps them pot balls--and I do realize that for some shots it can--but because they don't already understand positioning with speed, and/or controlling the cue ball with top/bottom, they don't realize that hitting side doesn't really do anything for them. More to the point, they don't know what it *should* do for them.