I think maybe they should have kept building Tailwinds CSS, release new versions, then charge a subscription to teams for their agents to access latest changes in their documents.
In other words, the documents for the latest versions are hidden behind a pay wall.
If you release new versions without documentation it's easy for agents to generate that missing documentation.
That's one way to ensure Tailwind v4 remains forever the only version anyone uses. Agents already are not very responsive to framework changes.