I have 14 YOE and its the opposite. Really brilliant jrs don't have the experience to know the consequences of their designs, they build fast under pressure. They reinvent things that already exist (they don't know because they a Junior).
I worked in the music streaming industry, which involves ingesting 10's of millions of XML files. Absolutely do not use XSLT. Schema changes between different versions of DDEX were a nightmare for all the legacy XSLT we had.
I don't see any reason to use this for AWS over CDK. CDK already has some pretty higher level modules that make it really easy to setup ecs, k8s, vpc, ect.
Every framework have worked on for the last 12 years has bugs, breaks in certain situations. Every system in fact, i have worked on in 12 years has bugs and breaks. That is just the nature of software development.
You should be using frameworks instead of trying to reinvent things. It takes away decision fatigue and makes it easier for most teams to follow conventions that are already established.