LOLOL....are you kidding? No knife that has been owned by me has ever been in a dishwasher. And I will berate anyone who does.
I remember being so surprised that I sent it in to Henckels and they sent me a new replacement knife, no questions asked.
But as I said, that was decades ago.
Over the years I have "repaired" two other people's knives that were full tang western handle. One was a vintage Kyoto Aritsugu, a really nice carbon knife. when it came to me the handle was bloated out from the tang rusting and scaling. Had to take it apart and clean that tang up.
From such experiences, my initial belief that wa-handles were inferior because I had seen quite a few very old knives with deteriorated tangs changed. Western handles can also fall victim to corrosion under some circumstances.
Personally I believe that hand washing and wiping dry as soon as possible after use is the proper way to preserve the life of the knife. Regardless of steel or handle type.