Kyle:
I'm not sure where the title or premise of this thread comes from. What do you mean if PV sand-proed their bunkers? I'm almost sure they do at least that's the way most all their bunkers that a sand pro could get into look to me. That's the way it all looks to me and has for maybe a half dozen years now. It gives a whole lot of PV's sand area a pretty clean and maintained look.
Before that most all sand areas were a whole lot rougher looking---eg at least the sand itself was.
I mean up until maybe a half dozen years ago when you walked through some of the massive sand areas of PV like #1, #2,#3, #4, #7, #16 there were about ten million footprints all over those areas. No more---those areas are always pretty clean and well maintained now.
Personally, I think they should just go back to the way it always was all these decades. They got to the top and that sure didn't hurt them---it probably enhanced their reputation because of that. PVGC, the #1 course in the world was the last golf course I'm aware of that hardly raked their sand areas at all, and they probably have more of it than any course.
I'm also not sure what you mean by your question; "could the corridors have been more preserved?"
What corridors? The hole corridors? One interesting thing about the hole corridors of PV, the fairway hole corridors, at least, is they have virtually never changed and the reason for that is PVGC basically never had any rough. They only have slight ribbons of it today so the fairway mowers can turn. Frankly, they could probably just cut out those turning ribbons of rough if they decided to just go with an up and back cut all the time.
That's one of the interesting things I just learned on that up and back fairway cut thread I started. For clubs that go to the up and back cut they don't have to turn in the rough about 200 times per hole.