I don’t agree with your comment about AWS cloud having ‘well-known’ security weakness. Customers are choosing AWS over other providers because it has a lot more functionality, the largest and most vibrant community of customers and partners, the most proven operational and security expertise, and the business is innovating at a faster clip. Security has always been AWS’s top priority and it has been architected to be the most flexible and secure cloud computing environment available today. The core infrastructure is built to satisfy the security requirements for military, global banks, and other high-sensitivity organizations. This is backed by a deep set of cloud security tools, with more than 200 security, compliance, and governance services and key features.
About the other breach that you mentioned, it is explained in its disclosure that the type of vulnerability is not specific to the cloud, meaning it doesn’t matter where the application was running, whether in the cloud or on premises, because the attack targeted the application and not the underlying infrastructure.
I don’t know if you have any current hands-on experience with AWS, but if you do; you can reach out to me 1:1 and I can pass on the feedback to your Account Team or you can reach out to them directly to alleviate your concerns.