Is it really “lightweight”? Have you ever run a business and been responsible for pricing strategy? I have, and I thought the post made a good point—if pricing is tightly coupled to billing implementation, it discourages experimentation since pricing changes are technically non-trivial.
If you don’t relate to that, maybe the post just isn’t for you? HN is a forum for engineers and entrepreneurs—it’s run by a startup accelerator, after all. Not everything on it has to be purely technical.