Should I auto-confirm new subscribers?

One of the questions I get routinely from clients big and small is, "Should I auto-confirm new subscribers." I've gone back and forth with the Kit deliverability team on this. Kit recommends that you do NOT auto-confirm and instead use their double-opt-in feature to confirm new subscribers really want to be on your email list. Though this is good advice for people new to the email marketing space and is good for helping Kit keep a good sending reputation, but this is terrible advice if you...