> I adore Nebula and half wish I had chosen it instead of Tailscale+Headscale...

Could I ask you to expand on that a little? Besides Tailscale's "network shenanigans" with firewalls and routing tables, what else do you find that Nebula does better than Tailscale? Why would you recommend Nebula instead of Tailscale to someone who hasn't used either one before; what's Nebula's big "win" over Tailscale? (Assuming that this person's usage would fit within Tailscale's free tier so price isn't a consideration, because obviously free is nicer than $$$/month if your usage is large enough to be outside free-tier limits).