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.
I didn’t say anything about the heat treat or anything, specifically because, like you said, the dishwasher isn’t reaching temperatures where that matters.
I also didn’t try to claim that your detergent would rust your knives. This is literally all just you.
All I said at the end of the day, is that your knife edge is more delicate that everything else you’re comparing it to, and your dishwasher can bang it against things which may chip it somewhat, unlike everything else you’re comparing the knives to.