Vantaggi
Working as a level 3 or higher is way better than working on the floor. The pay is good, with nice benefits. As a support function, being able to manage my own time is a great advantage as I hate presenteism. Having access to lots of information and training is really important to me, as you can gain autonomy pretty quickly inside the company. There are lots and lots of roles that you can apply for, and even inside the company it is encouraged to discover what you are good at, and if your current role fits you or not.
Svantaggi
The need to push people to do their best shouldn't blind to the fact that people are humans, have a learning curve, and that trainings that are not targeted to the role of the person should be avoided, or at least reimagined to fit a person's position. Amazon shouldn't expect people to be fully functioning in their role during their formation, which is why formation exists in the first place.