It's bad for the elbow joint to do bi and tri exercises incorrectly. Yet is is bad for the elbow joint, if all that you do, are bi and tri exercises, even if you do them correctly. The elbows also rotate around the joint. With out doing exercises for that elbow function, correctly, you are creating muscle imbalances relating to the elbow joints. The tri and bi muscle get strong, and the rotational muscle movements don't. Use it or lose, as in injure it.
Concentrating only on big lifts, and the bigger muscles, is a common error that lifters make, whether for muscle strength, or muscle size.