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.
How does a dishwasher dull a knife?
I run my steak knives through it all the time, they get sharpened 1/4 as often (or less, like 2x a year) as my hand washed chef’s knife, which could be sharpened every week (it’s a very good Henckels set).
Placebo problems created by hyperfocusing on one thing (knife sharpness) leading to bullshit flying around