I think the worst American influence on the GB&I courses is conditioning. I remember playing Narin years ago and it was soft and green
Who wants to play a soft green links course? I asked and they said Americans like green grass
I have also told the story here about playing Royal Birkdale years ago before The Open. I asked the member who was a good friend what they did to get the course ready for the championship? He looked at me funny and said, “they put up some stands, maybe toss a little seed on some spots, open up the back tees, and tell the boys to come in and have a go.” My how that has changed and so have some of the courses as when maintenance changes it seems to lead to other architectural changes as well. You can still find some courses that seem to embrace their history and haven’t tried to cater with pristine manicured maintenance to Americans (Carne comes to mind) but they seem fewer and father between.
Note: I saw a new word in this thread - “spirit”. Are we now content to recapture the spirit of original architectural features? How is that different than trying to recapture “original design intent”? And is one or the other still restoration?