Hello. Sure, I understand your point.
Stacktape is not exactly a "PaaS in your cloud".
Similarly to serverless framework, it works on the developer's machine (or on a CI/CD server). You don't have to "install it to your account".
Compared to those "PaaS in your cloud" tools, you don't lose control, flexibility or security. You have the the full power and control of AWS (and other 3rd party providers Stacktape supports).
Stacktape is also very transparent about what it does. You can extend it (using AWS CloudFormation) or modify the generated template.