2020 is all in on everything bad that can happen.

Eggs and baskets etc etc

Good DNS practice (at least when I did system admin 10 years ago) was ALWAYS having a secondary at some other location/network. Why do we just put some info in Cloudflare and call it good these days?

It's hard to use Cloudflare as a reverse proxy without using them as your delegated name servers (maybe you can use CNAMEs on paid plans?), and fancy dynamic nameservers make it hard to run secondary servers with zone transfers.

This is definitely the answer I needed.

Because we don't do tech work anymore. We put in a credit card and click "Buy Now." Also, nobody got fired for using Cloudflare.

Features, convience, pricing.