You get a scale at AWS that is hard to find elsewhere. There are still a huge number of very smart people there. You can learn a lot. I loved my time at AWS.
That said there are a ton of cons. There's an entrenched management class that is disconnected from reality. There are a number of ~L8-L10 folks who don't believe or understand how they're falling behind the cloudflares and other providers. There is a bizarre arrogance in Seattle that masquerades as "willing to be misunderstood for long periods of time". People aren't afraid enough.
What AWS will struggle with over the next few years is verifying the results of the narratives they tell themselves. At some point along their evolution a disconnect between narrative and reality happened and someone needs to bring everything back to a baseline of reality. Leaders tell a story of their success (that I'm sure they themselves believe) and no one follows through to actually verify the results.
This issue of lack of narrative/reality baseline, to me, is a cancer at the heart of AWS and if it can be addressed then I think they can recover and shine. Otherwise they'll fall into the same trap as MSFT back in the 90s/2000s where they think everything is going just fine while the floor falls out from under them.