I skimmed it. I had seen it before. Has there ever actually been a time when a significant naval power had a navy made of all ships of the same class? I really don't know, but I doubt it. The closest I think the world has come to a cookie cutter fleet would be the Liberty Ships in WW2, but those were freighters.
Aside from a handful of remaining Ticonderoga-class cruisers and three Zumwalt-class, all of the U.S. Navy's major surface combatants (a category that excludes aircraft carriers and amphibious ships) are members of the Arleigh Burke class (classified as a destroyer, but functionally a light cruiser).
We ultimately plan to build ninety-nine of them (seventy-four are in commission), and Japan and South Korea have build a dozen derivatives of slightly different design.
That being said, the Arleigh Burkes aren't direct copies of each other. Beyond individual differences among the ships, Flight I, Flight II, Flight IIA, and Flight III are are visually distinguishable—and the SEWIP Block III ships are especially distinctive.