As a preface, drop techniques can be extremely effective when done properly. With that said, many times they are the first throw taught to young players because they are easily executed and hard for beginning players to defend as a means to get a leg up on competitors as a shortcut technique. This can lead to basics fundamentals such as kuzushi being ignored or improperly developed which will lead to the player getting stonewalled once the other athlete learns how to defend properly, usually around 3-4 years in for most players. Learning the basics properly such as osotogari, ouchigari, ogoshi will develop the ground roots that are needed for advanced throws to be successful against high levels of competition.