"Don't nurse to sleep!!"

I keep seeing people say not to nurse your baby to sleep but that's my and my 1-month-old's routine. She nurses, dozes off, I poke at her to wake her, she finishes nursing and she's out like a light. And she sleeps so heavily it's very hard to wake her when she's nice and full.

So what's the worst that can happen because I nurse to sleep?

Don't sleep regressions still happen in FF babies? I read that it was related to their brain development and changes.