It seems to be an easy fix to reduce an unnecessary environmental impact, save animal lives, save money on carcass cleanup crews and wire damage, and increase public goodwill. Is there a FAA reason for having steady lights, is it bureacratic inertia, or are the rules accommodating the owners of older towers, or the manufacturers of steady lights? I think if I were a pilot a flashing light would catch my attention faster than a steady one (cf, blinking vehicle turn signals).