Basically letting Cloudflare take ownership over DNS. So much better then logging into x amount of different domain registrars web management panels. Its not really directly comparing to your BIND solution. But a lot better then what he/she currently struggles with.

Externally. Why not take use of the good options out there and make it easier for yourself?

Why not just use Cloudflare? Redirect client nameservers to them. Also you can pay them if you ever need prioritized support. Free plan is solid usually.

DNS is scary to selfhost.