(edits:) It's clearly not ideal for a short lunar landing, considered in isolation. But: what else would you do? Whatever you build, it would land on the moon perhaps once, and never again. Would you, being in charge, design a one-off vehicle for one or two moon landings—spend that R&D budget, in that way? That's not cheaper than 15 Starship launches; it's considerably costlier. (But the Apollo engineers didn't need to worry about this; it's was their express remit to spend $200 billion on one-off designs that would never be used again).

And: I hope no one suggests the "just make a unique lunar Starship variant that's simply a bit smaller". There's no "simply" resizing things in engineering. Recall that the last time Starship's length was altered by 2 meters, new mechanical resonances appeared, and it blew up three times in a row. Any "one-off" change for lunar landings is a less-tested, less-understood machine you'd be putting human lives on.