You're pedantically correct, and that's cheating, as it's still more than "a gate"

. The NAND is an AND and a NOT. When ICs cost a bundle and it paid to get the quantities up, we bought all two-input NORs or all two-input NANDS, plus flip-flops, for our logic. It was cheaper than busting the quantities down by ordering two-input, three-input, four-input, XORs, etc. MSI and LSI sure made things easier when they came along.