> I have a guide that I wrote https://dynip.dev/guides/tailscale where I explain how and why they can exist

Your guide sounds obviously written by an LLM. I think that's okay, and you might have directed the LLM's work, but don't say you wrote it; this misrepresents the guide as more carefully crafted and authoritative than it really is.

I would have been all over this a few months ago but I've recently been an enthusiastic convert to netbird recently. I had a look at your guide. I am using netbird reverse proxy to expose a few services and it's been pretty much flawless. It saves me from needing to set up port forwards or worry about a firewall.

Do you see an advantage or alternative benefits to also having a public dynamic DNS, because for me I am struggling to see any?

This makes me really happy, like really really. It is the exact part of the /guide where things work together and not agaist or replace, synergy and happiness.