Why do we write bios in the third person?

I was talking a while back with Sarah Vermunt of Careergasm about how bios are written both in business and in the theatre. Its common that these are written in third person (Phil is a taco loving, dog-petting, decent fellow). Sarah wonders why that’s done. She calls it inauthentic, and she’s not wrong. After all, we write our own bio. Why do we pretend we aren’t writing our own bios.

Now, Sarah works in business and entrepreneurship. But we do the same thing in theatre. We write our bios as though we aren’t writing our bios.

Why don’t we write our bios in first person (Phil loves tacos, petting dogs and is a decent fellow)? And should we start?