The tailnet domain doesn't really matter that much if you have your own. I just use tailscale IP for everything that's not in adgaurs with a host name already
Tailscale is amazing. When i first started self hosting i tried a bunch of things to avoid a companies solution but tailscale just works perfectly and form what they say in interviews they dont intend to change the free tiers. Its also open source and there's headscale so eventually you could not rely on the company at all.
If it's just for local you can add dns hostnames in the gui. I have all my lan boxes defined in pihole with the .lan under the local dbs ootio. Might even work for external too
I believe they are revoking the grandfather plans this yr. I received an email saying my price was going up and I've had it for years at the same price
The tailnet domain doesn't really matter that much if you have your own. I just use tailscale IP for everything that's not in adgaurs with a host name already