From what I’ve read about double edged blades, the first ones made from carbon steel might well have been the keenest, when new. But carbon steel is hard to keep from rusting when wet.
Then Gillette coated the carbon steel blade that helped it glide, but those coated blades wore the coating off and actually got keener after a few shaves. And rust was still a problem.
Then Wilkerson Sword developed a stainless blade that helped the rust problem but they weren’t as keen as carbon steel.
After that, the makers began to coat stainless blades, and each one is a bit different in performance.
What no single blade can do, even a straight razor, is have one blade pull out a whisker and the next blade (or blades) cut it off.
And the amount of research and development used to make the latest five blade cartridge means they are going to be comfortable and quick to use, for about $2 a blade.
Likewise modern gel shave creams soften whiskers and protect skin to the maximum amount industrial science can do it.
But that’s too easy, for a good morning ritual.
When my Gem blades come, I’ll be eager to try those.