different techniques work for different body types.
it's like kindergarten thru 8th grade - everyone starts off learning counting and their ABCs. then you learn addition, subtraction, and reading. then you learn multiplication, division, and sentence structure.
building these foundations lets you explore new ideas in disciplines with a more focused manner - composition/voice in writing, functions in math, etc.
most people never need differential equations or technical writing, but it still behooves the former to know how to string sentences together and the latter to know how to compound interest.
same thing with judo - each throw will re-enforce fundamental concepts shared by all judo throws, while the variety will provide people a repertoire of throws that gives them options for specialization.
Physical literacy is both general and sport specific, for sure. One issue I run into is that people often expect something like "instant success" in whatever they are doing.
So being able to jump, crawl, hop (one leg, two legs, bunny, etc.), roll, skip, etc are fundamentals of human movement. Then there are more specialized, compound movements of a specific sport, Judo in this case. Which are made up of more specific versions of the fundamentals of human movement (physical literacy).
So a guy can do O Goshi with uke walking right at him, and so thinks he has mastered O Goshi. I see this pretty often even when teaching competitive teenagers, although with time they start to get the point you made in your post. The various sutemi waza come to mind as a good example.