Ian
My views may not be of interest, but I will voice them all the same as this is a discussion site and you have asked a good question.
A new or newish course then, the answer is very simple, follow the Clients instruction to the letter perhaps pointing out the odd alternative.
A Course that has a pedigree, a close connection with an important architect whose name is used to attract golfers to the Club, then that a different kettle of fish. The problem which must be resolved is the definition of the brief – what is the intention of the Membership (a) Correct Restoration; (b) Part Preservation/Restoration; (c) Modern reconstruction (d) Or something else not yet fully disclosed.
We have an agency in the UK, well based in England called English Heritage, which is very strict on allowing work to be undertaken on site of historical importance. If you restore a Graded building you have to use the same materials as originally used. Modern alternatives are nearly always rejected for the real article. There is no choice, you finish what you started.
So restoration means restoration in its entirety – no compromises whatsoever. Historical courses are part of our heritage no matter where in the world and as such should where possible be preserved and the duty lies solely with the owner/client.
The responsibility is not with the architect but with his Client, if they are unable to provide a firm brief – Walk away. Compromise in this situation is not possible as one sector or other may be unhappy with the final result. Original historical course with modern bunkers equals a flawed course, no matter how good the architect.
The Membership must be certain what they require otherwise do not start the project in the first place. This is I expect not a Design & Build project so the Client MUST provide a clear brief.
From what’s been written, the architect does not have the authority to modify the course and should seek confirmation from the club as to their requirements, if this is not forthcoming, you and your reputation have no choice but to distance yourself from the project. Comprises and reputations do not generally go hand in hand and I agree with Tom. I have declined other non golfing projects in the past because of a confused brief. If the problems start before you even get to site, kept walking (or should I say driving).
A reputation will take many years of extremely hard work to achieve but can be lost overnight. At the end of the day the architect must decide what is more important. I know my answer.