>>44861182First of all, the Fairy egg group and Fairy type aren't the same.
The Fairy egg group uses "妖精", or yosei, while the Fairy type uses "フェアリ", which is literally just "fairy" in katakana.
In contrast, the Bug, Dragon, and Flying egg groups all use the same word. The water egg group uses the word for "underwater".
By your logic, should Monster/Kaiju type should also exist because it's an egg group? Yes, because that would be awesome, but that's not the point.