For me personally, I have little motivation to do classical sudokus. They either have a not-so-elegant solve path (usually set by a computer) or are too difficult for me to solve.
Variant sudokus on the other hand are a lot of fun. They often have very elegant solve paths and there are many neat tricks you can discover and reason about.
To each their own, but the puzzles you linked seem really convoluted compared to regular Sudoku.
The last puzzle has no fewer than 9 custom rules, in addition to the regular Sudoku rules, and then it also says “every clue is wrogn [sic]” implying there is some meta out-of-the-box thinking required to even understand what the rules are. That is more a riddle than a logic puzzle.
By contrast, the charm of classical Sudoku is that the rules are extremely simple and straightforward (fill the grid using digits 1 through 9, so that each digit occurs exactly once in each row, column, and 3x3 box) and any difficulty solving comes from the configuration of the grid.
I also mostly enjoy Sudoku variants, most of which I discovered via Geocaches, interestingly.
After solving a few I then implemented a solver with customizable constraints, if anyone's interested, should still be available here:
The last puzzle has no fewer than 9 custom rules, in addition to the regular Sudoku rules, and then it also says “every clue is wrogn [sic]” implying there is some meta out-of-the-box thinking required to even understand what the rules are. That is more a riddle than a logic puzzle.
By contrast, the charm of classical Sudoku is that the rules are extremely simple and straightforward (fill the grid using digits 1 through 9, so that each digit occurs exactly once in each row, column, and 3x3 box) and any difficulty solving comes from the configuration of the grid.