Seems a better reason for not using stainless-steel instead of copper in miniature boilers, than mere bureaucratic fear! (Silicon-bronze of appropriate grade may be better.)
Oh, fashion is responsible for all sorts of stuff and nonsense! Write a pseudo-scientific ad, pay some “celebrity” to read a load of waffle praising it, bung on a silly price, stack it in a so-called “high-end” shop…. and watch the sales climb.
More seriously though is a widespread fear of using aluminium for cooking-vessels, by long-term aluminium poisoning implicated in diseases including Alzheimer’s. That probably depends on what is habitually cooked, how the pan is cleaned, and I have not seen any definite information either way.