Because a power set is only the slightest thing there is to a character. People create the characters they need in order to tell their stories. They may not be aware of earlier characters, or those characters may have aspects to them that don’t fit in with what the story is going to be. Plus, it can feel exclusionary for certain readers to bring back an obscure character from decades ago if you don’t need to. On top of which, you never know what new character is going to hit–certainly Spider-Gwen was a surprise that wouldn’t have happened if some other established spider-person such as Jessica Drew or Julia Carpenter had been used there.
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