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The average Commander deck will prioritize Eternal Witness and ways to recycle its ability before they ever even consider Den Protetor as a back-up, but morph decks can use it as a synergy piece and likely have ways to reuse its morph ability to pick up extra cards

Saying otherwise would be a lot like saying to not put milk in your cereal or to not spray badger repellent onto your swamp boots

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Except for determining whether or not a permanent can transform, a spell, ability, or rule that needs information about a double-faced permanent sees only the information given by the face that's currently up

That said, both of these rules were broken in later years, with sets like Commander Legends , War of the Spark (through planeswalkers), Dominaria , Dominaria United , Kamigawa block, and The Lord of the Rings: Tales of Middle-earth used Legendary cards as a mechanical theme, with uncommon Legends to boost up the numbers in Limited play