[tybris]

I would say the opposite is true. Amazon is a collection of largely independent product teams that make their own decisions and share very little code. Infrastructure services are used based on its merit. Stuff that works stays, things that don't die out. Unlike most tech. companies that depend on large, common infrastructure, Amazon is carefully designed to evolve.

Main problem is that a new family of species called AWS is so well-adapted and successful that its population is rapidly outgrowing some of the older, less dynamic species on which it depends. You can call that technical debt. I'd call it progress.