Two answers to this:How can you control your opponent's structure if you only control his wrist? IMO, the elbow lock, shoulder lock, head lock, spine lock, ... are more effective.
Even the finger lock can be more effective than the wrist lock.
1. You break and control the structure on entry, so the lock is a result of what came before (positioning, strikes, off-balancing, etc.).
2. Conjunctive locking, where the lock on the wrist also puts the elbow in a partly locked position, which puts the shoulder in a partly locked position, and so forth.