ASW
ASuW is reserved for surface warfare
But it wouldn’t make sense to send 64 VLS ships against 96 VLS ships in a slugging match
No one fights at sea this way. Youtube channels, maybe.
Typical norm(with mathematical basis behind it) for group AAW mission is 48 cells, anything above means what you're something very large and acting as a reserve, or you're seriously considered to be detacheable for independent missions in hostile waters(read: you are a cruiser).
Simply because no one will be so kind to let you gradually use your missile stock. You either can defend, or attacker is capable of amassing such a salvo what you will simply bring more unused missiles down with you.* Most likely, though, it means what your ship or task force happened to be somewhere where it must not be to begin with.
Not AAW-intended ships(even with a long reach) recently found a new "sweet spot" at just 16 cells.
And here we have a 052D with its 64 fully universal cells.