For almost all materials the only value of getting a seriously produced work of design (i.e., the "make me a magazine-style pitch deck for our seed round" this design engine mentions) is a signaling function that some combination of effort and capital went into its production. Yes, the 1 in a 10,000 work of design adds some actual value. But usually it's just a filtering mechanism. The purpose of making a powerpoint deck before a meeting is rarely the value of a deck. Rather it is signaling that someone spent some time actually organizing their thoughts instead of bloviating spontaneously.
All of this is lost with AI led design. Producing designed artifacts are free and instant. Yeah you will impress the old folks for a year or so who haven't caught onto the joke. Eventually this just becomes pointless table stakes. Just the same way desktop publishing was in the 90s. You impressed the old folks for a bit until it all became background noise table stakes.