Maybe he cares first about portability, e.g., easily moving a binary from one BSD-based device to another. Not all devices have the same space limitations.

There might be other reasons, too. Static binaries fork faster, but this works best if they are also small enough to remain entirely in the OS's cache.

There's nothing wrong with dynamic linking per se. Nor is there anything wrong with static linking per se. ("Per se" as used here is intended to mean "in all circumstaces".) The use of one or the other is simply a choice. There are advantages and disadvantages with each method, based on the circumstances and whatever the desired result(s) is/are.