I'm wondering why the grid notation doesn't account for the irregular variation, and why the grid size values are hard coded, so mini and large-size sudoku is o

I'm wondering why the grid notation doesn't account for the irregular variation, and why the grid size values are hard coded, so mini and large-size sudoku is out too. The second is easy to correct in a live (i.e., not pedagogical) version. The first is a bit more difficult.