In big corporations that's how it is. Developers are told to only implement what is in the specs and if they have any objection, they need to raise it to PM who will then forward it to the system architect etc.

So that creates the notion as if the design was something out of reach. I met developers now who cannot develop anything on their own if it doesn't have a ticket that explains everything and hand holds them. If something is not clear they are stuck and need help of senior engineers.