The thing with the F9H is, that there was no real need for it for years, it almost got cancelled entirely. The F9 was improved to a point where it could do most

The thing with the F9H is, that there was no real need for it for years, it almost got cancelled entirely. The F9 was improved to a point where it could do most missions which initially were thought to require a F9H. So the development of the F9H was done at a lower speed than if the business had depended on it. But as there seem to be some contracts requiring the F9H, they made it eventually. How often it will fly though, entirely depends on how quickly the Starship progresses.