The way they communicated it was very, very amateurish. They needed to know when they could re-key their certs - seems like it was impossible to tell. That's something that needed to be done ASAP. Without knowing precisely when the environment that affected them was updated, this client couldn't get that done as quickly as they might have.
It's not amateurish, it was just poor communication in a situation that they've (fortunately) not had to deal with. Which happens from time to time; and good companies recognize their failures and fix them. One thing I know about Amazon from friends who work there is that they don't tolerate failure. They have a culture of owning your mistakes and fixing them; anyone who doesn't buy into that attitude will get fired pretty quickly (and Amazon fires a lot of people.)
It's pretty fucking professional to update the infrastructure that runs half the internet in under 48 hours with no issues. But again, communication can be a problem when you have as many customers as they do.
OP raised some legitimate concerns, but his credibility was undercut by attacking Amazon and calling them names. Ironically, his post was a much more amateur move as his concerns would likely be taken more seriously if he had stuck to the issues and not resorted to name-calling. The essence of professionalism is sticking to the issues at hand and not being sidetracked by extraneous factors.
