Depending on when the Great Fairies' side quests are taken, it's common not to realize that Lizalfos Tails are valuable upgrade materials until later in the game.

Source: https://screenrant.com/zelda-tears-kingdom-best-fuse-items-weapons-totk/

For example, a Silver Lizalfos won't drop a Silver Lizalfos Tail.

Source: https://gamerant.com/breath-of-the-wild-lizalfos-tails/

For example, a Silver Lizalfos won't drop a Silver Lizalfos Tail.

Source: https://gamerant.com/breath-of-the-wild-lizalfos-tails/

This is because the foe has the ability to summon skeleton allies and use magic against Link, which represents a greater threat than the Lizalfos.

Source: https://gamerant.com/totk-zelda-tears-of-the-kingdom-how-complete-uninvited-guest-quest-guide/