You don’t need to use it as an exit node. But yes, running tailscale in a container can be problematic for accessing some apps. You should give this thread a read: github.com/truenas/charts/issues/2201

It offers some explanations on what might be going on. I have tailscale set up on a different device (raspberry pi), and it’s working as a “subnet router”, meaning I can access all of my local subnet when I’m connected.