Focus on the business problems
As a full-stack developer myself, sometimes frameworks are chosen out of "coolness" and trying to be "modern", while neglecting basic business practice of solving actual problems.
Software development is complex. If your stacks do not solve any actual problems that your developers have, then you're only adding to the pile.
For you, really grill the higher ups on what business problems you are solving with the frameworks and evaluate two things:
- Does the stack actually do what it needs to do?
- Are the devs using the stack properly to solve those problems?