I would be careful trying to compare newer 700c wheels to old 27” wheels. They aren’t built the same externally or internally. Same goes for the associated tires. But then I’m not an advocate for under or over inflating tires. The old style 27” tires like mine are labeled “inflate to 90 PSI.” That’s how I ride them. The ride on my vintage Nishiki International is responsive, supple, and sure. No need to fix something that was never broken.