I had the same thought - if SO says they're fast because they don't use DI, then ok, maybe SO is fast because they don't use DI AND they have an elite group of amazing full-stack programmers who write OS kernels and prove that P != NP over their lunch break for fun. Most programmers fuck things up on a regular basis and don't even realize it until it's broken production for a couple of years for a handful of users who go down a non-standard path every once in a while, and they do it in a way that would have been caught if the code had been run even one time, but they can't run the code, because somebody else insisted on using a hundred static (i.e. global) variables.
I had the same thought - if SO says they're fast because they don't use DI, then ok, maybe SO is fast because they don't use DI AND they have an elite group of amazing full-stack programmers who write OS kernels and prove that P != NP over their lunch break for fun. Most programmers fuck things up on a regular basis and don't even realize it until it's broken production for a couple of years for a handful of users who go down a non-standard path every once in a while, and they do it in a way that would have been caught if the code had been run even one time, but they can't run the code, because somebody else insisted on using a hundred static (i.e. global) variables.