True however carriers are not exactly cheap so if you buy/build one why on earth would not equip it properly?
This is a common mistake people make, and I believe it's caused by thinking about the issue as if it was one in which practical concerns were uppermost. In actual fact political concerns will often trump them, and short-term expediency will blind decision-makers to potential drawbacks if the equipment has to actually be used in anything but the most permissive environments. This short-sightedness costs lives and is in my opinion far more expensive in the long run, but it is remarkably consequence-free - usually any unpleasant repercussions occur during a later administration, and in any case it's the taxpayer and the soldiers/sailors/airmen who will bear the brunt of them.
Example: the New Zealand airforce purchased some Boeing 727 aircraft for it's transport fleet. This was quite an expensive purchase, and in order to save money they were directed to specify engines less powerful than those usually fitted. This increased the runway length required for takeoff with a heavy load. It was important, however, because New Zealand is a considerable distance from it's nearest neighbour. This lead to a situation in which the aircraft could not take off from military airbases with enough fuel on board to fly to the closest neighbouring country (Australia) because the engines were not powerful enough to take off in the existing runway length. Instead they had to take off, fly to a civilian airport, fuel up, and then use the longer runway to take off with a full load.
Anyone with military experience (and probably most people without) will be able to relate similar examples, where the most idiotic decisions get made just because they're slightly cheaper
right now, no matter how penny-wise and pound-foolish they are in the long run.
Addition: to be fair budgets are limited, and it is not always possible to afford the ideal piece of kit for the job at hand. In general we have to hope that what we get is "good enough" and available in sufficient quantity for the task. It's a bad sign when a military has equipment that it can't afford to lose, or train with - there are stories about Australian AT troops drawing straws to see who would fire this years live Milan ATGM.
