About 18 months ago, the requirement came that federal agencies are required to be IPv6 Only, dropping the dual stack. IIRC they have until 2025 to do that. This has the neat effect of forcing all vendors to make IPv6 a first class citizen. The extra little fun from this is that it applies to the military JWCC contract that all the major clouds have been trying to land. The timescales of JWCC meant that initial offerings are pretty bare, but that won't be allowed to last.