That's the price that's paid for such leverage. High employee count is better protection from competitors but more expensive. Leaner teams are cheaper but may be susceptible to competitors. Of course, caveats abound as many times leaner companies are the ones that can move faster, see startups.

This is all very similar to standing armies. The more people, the more expense but better protection. What countries do, therefore, is let other countries do part of their jobs, ie US protecting many other countries who don't have large militaries. I'm not sure what the analogue is in business, maybe partnerships?