Saucepans: Black vs Stainless Steel

Planning on getting pans in sales. Can I just check why people say you can't put non stick saucepans in the dishwasher - why not? We've always done it and our good quality ones have survived (the outside of them got a bit discoloured but I don't mind about that).

Why are you not meant to dishwash them - I can't imagine handwashing them all the time. Thanks
 
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