The other category is the specialist who lives on a specific surface and has the tools necessary to survive and thrive on that court type alone. For example, the clay court specialist often has big looping groundstrokes, stamina like a race horse, and an adequate serve, volley and front court game. If you want to become a professional, then you have to have strengths and stability. Weakness on the tour is not acceptable, it just doesn't work. Good players will always find a way of exploiting an opponent's weakness.
Strengths are shots that can put an opponent on the defensive during a point.
Stability is a player's ability to stay out of trouble but not really mount an offensive shot, like a good overall backhand that is consistent but not dominating. Weakness is a shot that is inconsistent, vulnerable to mechanical or psychological breakdown. Hey, I'm 5 foot 5 and a half inches tall, so don't tell me that I don't know what it's like to be short. I know the advantages and disadvantages. Truth of the matter is for many years I have seen players who are around the 5' foot height successfully compete on the pro circuit.