No, I wasn't actually nitpicking at all. State owned enterprises are almost universally subject to restrictions on how they deliver their services that makes it difficult or impossible for them to be profitable that private sector companies aren't subjected to. The USPS is a perfect example of that, but it applies to almost any state owned enterprise that you can name, especially those you would deem poorly run. And of course profitability isn't their goal, while it is the goal of private sector companies. I spent many years in government and many years as a successful entrepreneur, as a result seeing this apples to oranges comparison is frustrating when those making it really don't understand the underlying issues which are far more complex then they seem to think they are.
The example isn't perfect. It's a red apple to green apple comparison, definitely not orange. I understand the obligations of these companies in the public sector. The example you gave of US Post having to serve all areas regardless of costs but what I'm referring to are private companies that are not hamstrung by those conditions.