The analogy is apt because war is an existential threat for the nation. Similarly, competition is an existential threat to the business.

I don’t think this is about war being cool so much as competition in the market place can kill your business just like an invading army can conquer your territory.

It’s about then mindset that you should adopt. Do you suppose that it’s ok for a business to let’s it’s competitors take its clients and market share? No of course not. You have to fight to keep it and take theirs. If you are equally matched then you will likely find equilibrium in the market. If you aren’t then someone is going to get eaten.