I could see AI massively changing the calculus here. Its ability to hack and reverse-engineer (even obfuscated) artifacts may leave obscurity (read: not sharing code or binaries at all) as the primary security mechanism in the industry.

Yeah everything is open source if you’re good at reversing. Models are increasingly capable of converting binaries into source, and excellent at implementing systems when there’s a finite and constrained end state to validate against, which is exactly the profile reversing falls into.