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since tailscale exists, why would you care about cgnat or even pay to escape it?

I'm not the only person connecting to my machines.

Some applications want to open ports and don't have the server-side infrastructure to punch a hole through NAT. Especially P2P apps and some games.

Sometimes I want to run a small, low-traffic web server from home.

Sometimes I'm connecting to my network from a machine that I don't control and can't install Tailscale on.

Tailscale uses the same range as CGNAT.

You shouldn't be seeing the CGNAT addresses inside your home network, should you?

Depends on your network, router configuration. But in any case, if you install it on a router where the upstream uses CGNAT yes, you would.

Router straddles inside and outside. I know there's a way where you could put tailscale on your router but it's not the normal way to use it.