For maximum safety from registrar screwing up, don't put your main domain name in the glue records either, just ns1.example.com. But, it appears to be in the r

For maximum safety from registrar screwing up, don't put your main domain name in the glue records either, just ns1.example.com. But, it appears to be in the registrar's best interest to not encourage users to run their own DNS server -- as the article points out, that contributes to their lockin.