Bass Rocks is fun, but I wouldn't call it great even if it was sub-6000.
There are tons of old-world features like rock walls, chocolate drops, at-grade greens, and plenty of routing oddities. Everyone always says "too many rocks" because some of them exist on the far side of blind shots, meaning a shot can ricochet into oblivion without being seen every now and then, which is annoying.
The biggest effect on BR's evolution was the deletion of a couple road crossings and neighborhood-proximity issues with the removal of a few holes and the addition of 3.5 holes in the center of the front nine in the early 2000s. I'd say it was commentary on the increased litigiousness of our society, but some of these features were downright wild that they lasted for 100+ years without change. The new holes fit generally, but they have a modern feel.
The original version fit more completely with Leeds' design, but the current version is still a blast. I wish I got to play the full original version, but I only played the old front nine twice in High School. The removed holes are still in evidence as no property (I think) has been sold...they are now the driving range and practice chipping green next to the clubhouse.