Fireclay sinks may crack if you poor boiling water into them on a cold morning or if the garbage disposal is installed incorrectly.

It can chip if you drop something heavy like cast iron cookware. It can stain if you let foods with a propensity to stain sit on the floor of the sink for an extended period of time.

If you get a cheap copper sink, particularly one from India,China,or Mexico, then it may require you to dry after use or to wax it from time to time. If you get a finish other than a natural unvarnished patina inside the sink it may permanently scratch or discolor.

If you get a good Copper sink with a natural patina finish on the inside the only real downside is that acidic foods will clean the patina and it will look uneven until the sink patinas over in a week or two. It does not show water spots or have permanent scratches like stainless steel. Any scratch will patina over in a week or two.