Having been in the biz for my ownself just over 25 years now (33 overall) I may be qualified to answer this one!
To be honest, in the last 15 years, I think we got away from some basics - like keeping water from draining in bunkers - that the 50's-60's guys had figured out. Forget money not buying taste, its as if we thought throwing out money could outdo mother nature. Yeah, they got a bit too standardized because of their own good rules, but the ongoing cost of not doing things certain ways just gets tiresome when money is plentiful, and a real burden when it is not.
In the last two years, I believe we have learned the true definition of minimalism. If a large green is there, and a medium sized one will do, then it gets reduced. If a bunker doesn't see too many balls (its just their for looks) it will probably get removed, etc. The good news is, I think a lot of back tees and length will go away for similar reasons - why maintain 7700 yards for 25 guys a year?
Yeah, the first point is the same lesson learned from the 30's to the 50's (because of the depression and WWII) but it was totally forgotten and had to be relearned. The current length issue is fairly new from 1997 on and we are still struggling with that one, since no one is quite to the point of just not building 7200+ courses quite yet.