yeah, I wonder if there's room for a different networking abstraction that could address most of complex orgs networking issues, I, for sure, don't think that we should still think about cidr range limitations when making networks, for ex.
that said, I'm not sure the tailscale approach scales well in typical modern corporate environments, where you've got a small army of junior devops often overlooking security or cost implications (don't forget about egress costs!).
the traditional, meticulous approach of segmenting networks into VPCs, subnets, etc., with careful planning of auth, firewall rules and routes, helps limit the blast radius of mistakes.
tailscale's networking & security model feels simple and flat, which is great for usability, but it lacks the comforting "defense in depth" that will be asked in most big corps.