Pokémon Egg Group Combinations Could be SO Much Simpler...

Why are there so many Pokémon Egg Group combinations that have yet to actually exist? There are almost as many Egg Groups as there are TYPES in Pokémon, yet there are over 30 unused combinations when many of them could easily have been covered by existing Pokémon just by adding a group to one of the solo breeders, or swapping a couple around! So let's make sure each of the Egg Groups can have a link to every other, so that we can successfully get the egg moves we want on almost any Pokémon!