My tools serve me, not the other way around. It's not worth the time and effort to wash by hand or sharpen on a whetstone. I don't need an expensive knife to cook at home. A pull through sharpener and honing steel are adequate. Get the right material and you don't have to worry about the metal in the dishwasher.
Nonsense. I've put all my various knives in the dishwasher for years and there is zero visible rust on them. Every few months i use a sharpener on them and they're super sharp again.