Had a similar thing. Ex Company hired outside agency in order to deliver big feature on time. Lead guys in agency were sweet talkers and they were lying to C level executives(they believed them because of buzz wording). Agency overcomplicated the system with microservices, kubernetes, etc. Everything ended up more complicated and slower. Whenever you tried to suggest something they would just speak in private with CTO and you would get shushed. Half of our original team was moved to other projects because agency "new better". I quit and it was best decision