Implementing even relatively small features at Amazon takes quite a bit of effort, usually across multiple teams. The codebases are enormous, the number of serv

Implementing even relatively small features at Amazon takes quite a bit of effort, usually across multiple teams. The codebases are enormous, the number of services involved is inevitably at least a handful, athe side effects of a change can be hard to reason about, etc. The idea that a single engineer is going to implement a feature for one customer in some really short timeframe is just not in ballpark of reality. And even if that were a fathomable process, one must consider the opportunity cost of assigning engineers to one-off feature work rather than on vetted roadmap features. This sort of thing is frequently done at small companies trying to save an important contract or similar, sometimes to great detriment. Amazon isn't a place where a single customer (apart from maybe US government) has such pull.