We rely on our cars, but, overtime as we drive, parts start to wear out. Normally people don't even think about this wear and tear – I didn't used to – but it is an important issue. 12 – 13% of auto accidents are caused by mechanical failure due to recommended work being deferred. The worn out part continues to wear down, the parts around it work overtime to compensate and suddenly, several pieces of equipment are worn down, not just one.
When it comes to driving a car with worn out parts, the cold, hard reality is it is unsafe for the driver, passengers and the other people on the road. If that isn't bad enough for you, driving with a worn out part can also lead to higher repair bills down the road as it leads to multiple parts needing replacement. (If your shocks aren't working correctly, your ball joints, control arms, etc begin to break down from all the extra work.)
You can't avoid wear and tear to your car, but you can avoid extra repair costs by being proactive. When your technician lets you know that they see parts that are in need of replacement, ask them when it should be replaced, if it will do additional damage and if it is a safety issue.