Why is it okay to call the game a nonomino or kakuro, when it's entirely unlike either game, but so obscene to call it a sudoku, the rules of which it includes?

Why is it okay to call the game a nonomino or kakuro, when it's entirely unlike either game, but so obscene to call it a sudoku, the rules of which it includes? And it's not called a sudoku, by the way. It's called a sudoku variant. And yes, with classic sudoku requiring 17 clues, you just have to add additional hints to make anything with 16 clues or less solvable. And a lot of variant puzzles are still a lot harder than anything you'd find in a newspaper. There are lots of interesting patterns and strategies emerging from variants that scratch just the same logical itch as sudoku does. And sometimes ideas from variants get picked up by setters for classic sudokus, like the Phistomefel ring, which was popularized by a setter who mainly sets sudoku variant puzzles.