Can we discuss the fact that he forgot to mention that "having a good manager" makes people happy and productive? Because it's IMHO the most important thing tha

Can we discuss the fact that he forgot to mention that "having a good manager" makes people happy and productive? Because it's IMHO the most important thing that can make or break a good developer. The whole article only mentions topics that developers can fix themselves, not stuff that we cannot change and are very important in the daily work.