[HappMacDonald]

I dunno about you, but my NAND gate is implemented as an AND gate followed up by a NOT gate. shrug

[whitten]

So it’s less efficient than just implementing a NAND gate directly ?

[fragmede]

If you're implementing things in, say, Minecraft it might be, but the computer you wrote that on uses NAND gates. NANDs take fewer transistors to implement, are faster, use less power, and thus everyone uses NAND gates as their foundational gate.