The F-4 was a huge fighter on its own. A number of things bothered the F-14. As mentioned, one was its huge maintenance cost. But there were others, including its huge procurement cost per unit, leading to the F-18 being the lo end of a hi-lo tier.The fact that F-14 outperformed in many ways F-4 and F-18 did not lead to switching the carrier wings exclusively to F-14. One of the reasons being also the sheer size of the F-14.