The fundamental problem in this part of this thread is that people, those that do not crap in a barn , see the building process traditionally.
Owner hires Architect. Owner hires Builder. Owner might hire Engineer. Owner sets out the bid from the Architect's plan bleat blah baaaaaaaaaaa.
It's phorked, forget it.
Here's how it should go.
Owner interviews several engineering firms, checks references, etc etc, hires Engineer. Engineer co-interviews Architects and they, together, select one. Owner and Engineer go through pre, draft anf final plans (for bid) stage. Engineer is checking drawings, schematics, details, looking for wooly problems ahead of time.
Engineer, with Owner in background, co-selects Copntractor ona bid or cost-plus basis.
Barn gets built. Rain does not get in. ;-)
This can work beautifully if Owner does not care too much about design - BUT if they do, they should hire Architect first (with all the caveats about checking references, etc...) and then trust Architect to hire engineer, etc, etc....