The construction cost and maintenance cost of a destroyer can't be compared with tanks and fighters.
2. Another problem is the number of people-a 7,000-ton destroyer needs about 350 people, and 1000 is 350,000 people. It is also a problem to train so many people.
3. 1000 7000-ton destroyers don't have so many ports to berth.
4. Political factors. People will exert pressure. Didn't you obviously dominate the world with 1000 7000-ton destroyers-this is not a red alert.