Adulterated food products, shoddy construction that burns like paper or crumples in an earth quake, snake oil medicine, etc. are well attested in underdeveloped nations and in history at scales far above what we see in societies with the kinds of professional bodies we’re talking about.

That said, the reality is that this safety comes at a cost, both monetary and in terms of “gatekeeping.” And many people would be fine (on paper) increasing risk 0.05% in exchange for 20% cut in costs or allowing disruption of established entities. But those 0.05% degradations add up quickly and unexpectedly.