Comment by stackghost

No, what I'm saying is

1. Running a CA is more work than just setting up certbot for IP addresses, but not that much more

And that enables you to

2. Remember only domain names, which is easier than ip addresses.

I guess if you're ipv4 only and small it's not much benefit but if you have a big or bridged network like wonderLAN or the promised LAN it's much better.