there has to be some honda engineer dude somewhere like:
"it is wisest to do things the most difficult way possible, it is our duty to use dissimilar metals in high tension high stress/strain environment"
"hondamatic run good, until 30 cent part fails then we get to sell another hondamatic"
"cant they just rebuild the hondamatic?"
"no because we will ensure we manufacture a special seal for it and never sell it to anybody!!!!!"
"Oh you so wise engineer-san! yes we must follow this path!"