I’ve never heard a satisfactory answer to this. It always seems to be implied that it’s some effect of the water or the detergent or something, but in reality it always seems to come down to them banging into each other.
Which means that if you have a cutlery tray instead of basket, which keeps the knives upright and away from each other and anything else, it should be perfectly fine. IMHO a cutlery tray is far superior to a basket. I have one, always put all my knives (that are otherwise dishwasher proof) in it, and have never noticed any dulling.
To be honest the whole thing sounds like a myth to me. I think it’s probably fine to put your knives in the dishwasher, _especially_ if it has a cutlery tray.
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