Why use facial recognition to unlock iPhone instead of digital code?

What are the good aspects of iPhone facial recognition?

Yesterday I bought an iPhone 13 because the battery life of my iPhone 6 was less than 2 hours. The sales woman at the Apple Store seemed surprised that I didn’t want to use the facial recognition feature of the iPhone.

I’d rather not use facial recognition. I prefer to use my 6 digit code. Why? Truthfully it seems weird to me. Also in public we are all wearing masks now and likely will forever. I suppose that removing the mask in public could cause exposure to the SARS-CoV-2 virus to be an issue.