Adverse environmental conditions cause the need for a shorter post, or maybe just an adjustment. Very frequent adjustment wears a concavity in the top and the setter damages the ff holes. They are wreckers of ff holes and posts. The strings must NOT be buried into the bridge grooves. If any of these conditions exist, the bridge needs to be replaced by a professional.
Bridges do come in various quality levels.
The better the wood, the higher the price of the blank. Improperly fitted bridges wreck the top, besides not producing optimum sound. If not loosened, the neck will bend due to string pull. Finger boards, over a period of years, become rutted in the high traffic areas. Sometimes, the board changes shape.