Most of the dark patterns are not due to dumbing down UI. They're either because nothing better is available (security), income would be reduced (ads, cookie warnings, software is deliberately crippled for non-professional versions), development is done by lowest bidder.
Yeah. It would actually be pretty cool if web sites and apps were dumbed down for a few things: denying cookies, deleting accounts, contacting support, unsubscribing from spam.
With dark patterns those things actually become more complicated.
