They noted in the post that they had a fixed number of servers and those servers had fixed performance characteristics. A lot of what they say applies specifica

They noted in the post that they had a fixed number of servers and those servers had fixed performance characteristics. A lot of what they say applies specifically to that situation. The problem is that they make broader claims about the validity of best practices (design, OOP, unit testing). Those best practices apply just fine to the status quo, where you can scale out easily and maintainability is more important than performance.