Is there a reason there aren't Eevee evolutions for every type?

Question

How come they're aren't any rock, ground, dragon, ghost, fighting, poison, flying, bug, and steel Eevee evolutions?

Answer 1

Game Freak hasn't made them yet. That's really the only answer. If the pattern continues, and we get a new Eeveelution/Eeveelutions every second generation, we should be getting more Eeveelutions in Gen 8. But, that's just a theory.

Comments

No, the pattern is that we get Eeveelutions for special types. In Generation 8, they'll introduce a dragon Eeveelution, and then stop.

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How do you know that?

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Because all Eeveelutions already existing are special types. Fairy didn't exist before the category split, but if it did only have one category, I'm pretty sure it would be special.

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Source, please?

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Both are common internet theories, but they're just theories; there's no "source," per se.

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Okay....................