Yes, that is a fair point. However, the cost of drone versus latest generation ballistic missile that has a chance to reach us naval ship is very different. And in that sense, iterating on a drone is closer to iterating on a line of code because one drone would cost you a thousand bucks and your iteration is a small tweak like adding a different grenade triggering mechanism. Rockets require custom design, custom manufacturing lines, and generally much more difficult to modify and make more effective.

You also have a lot more tries with cheap drones since the target is lower value, so you have hundreds of data points on how each iteration performs vs hitting a naval ship which is an extremely rare event, so it's hard to see whether your iteration on a rocket actually succeeded.