While I think this is an interesting discussioni/debate, I think it misses the historical context and importance of Seaview and what it was intended to be, as well as how it evolved, or didn't.
For instance, Verdant Greene wrote the following around the time Seaview opened, and made clear the purpose of the course.
Seaview had its inception around the beginning of 1913. After the course opened formally in January 1915 (play on the course started in July 1914) Geist had a bit of a change of heart and brought in Donald Ross to "stiffen" the test with the creation of new bunkers. He also brought in a famous pro, Wilfrid Reid, as well as a top Superintendent in William Connellan at the time. Wilson had resigned as Greens Committee chairman at Merion in December 1914, citing the need to focus on family business after having designed Merion East, Merion West, Seaview, as well as co-designing North Hills in the previous three years as a part-time, "amateur" architect.
Some of Ross's proposed bunkering was completed, other proposed changes were not.
WWI intervened and not much happened with Seaview over the years, except for the creation of a William Flynn designed third nine, and Geist's attentions went south to his developments of Boca Raton.
So, today at Seaview, you have essentially the same course that Hugh Wilson routed and designed with additional bunkering by Donald Ross as those 1914-15 players were dealing with using hickory shafts and vintage golf balls.
Its 6100 yards, flexible at that time up to 6,400 yards at sea level on a very windy but flattish site, was never lengthened over the years. In many ways, it is similar to Merion West in that regard, although the latter on more challenging topography is a bit shorter still on total card yardage, if not in playability.
What's happened at Seaview over the years is that the greens have shrunken considerably...a few were also sadly moved and/or changed dramatically in size and context, a bunch of evergreen trees were planted in the 1950s, but all in all the charm and interest that was intended originally is still a big part of the attraction.
For a course to be large part musuem 100 years later, and still be a Doak Scale 5 is to me saying a LOT.
If you're an architectural history nerd like some of us here, it's a treasure.