I think this awareness will be really helpful only when talking to family, friends... Or to people who are already used to do some self-analysis when hangry.
Even if "being hangry" becomes much more "normalized" , a random person will still take it as an attack if you tell him that he's maybe hangry (the same way other cognitive bias are well-known but telling someone that he's being misled by confirmation bias will not be received well). People can even start building a defence mechanism to reject the " hangry remark " every time they are confronted to it.
It's the kind of things you can't say several times to the same person. Even the nicest, most patient people you know will quickly get really really annoyed if you're telling them regularly that they're hangry (even if you are right).
And we'll need to be careful, this can easily be abused as a tactic to silence people while discussing. Or we can start confusing " being hangry " with " being wrong ".
Another step is assuming that : " the purpose of a system is self-preservation and other things it does "
It reminds me of the Chinese Communist Party which is known for rejecting ideas which weaken their authority even if those ideas are good.
Many systems need to optimize for self-preservation and growth, especially in a very competitive environnement. Otherwise they will never be able to survive and accomplish their " more ethical purpose " (this have a " Meditation on Moloch " vibe ).
I am sure a good doctor will still be rewarded, even in a an hospital with a " money-oriented mindset ".
And in your Google example, will brillant engineers be rewarded if they always come with great technical ideas which barely bring money ?
A balance is needed and it is tricky. Of course many times it's not just self-preservation/growth, it is pure greed.