Why the United States did not welcome Britain's CATOBAR retreat

Why was the United States happy that Britain left the CATOBAR carrier business?

It was not really happy; the United States valued Britain's greater Central Front contribution but would also have preferred continued British CATOBAR capability in the Atlantic.

The United States was not pleased to see Britain leave the CATOBAR carrier business. American planners did benefit when Britain concentrated more resources on NATO's land and air confrontation in Germany. That shift reduced pressure on the United States along the Central Front. Continued British conventional carriers would also have strengthened Atlantic operations, so the trade was useful rather than wholly desirable.