Maybe we need to take a lesson from our local GC's ... or, perhaps, from trades that don't worry about "code.'
I mean ... can you even imagine a customer giving a GC a plan for a 4-bedroom house,and the GC arguing that the zoning ordinance only required three bedrooms for the family? Can you imagine the GC refusing to build it - or building three bedrooms and then arguing with the customer?
Can you imagine a painter arguing with a customer over what color to use?
Now ... let's fast-forward to the end of the job. The GC has built three bedrooms (because that was 'enough' by code) and the painter has decided that 'teal' was a better choice than 'aquamarine.' Would you expect the customer to be happy with that?
All you can do is quote the plans, and note any objections or questions you might have.