Checkmate nOcOiNeRs. If you criticize my pyramid scheme network, you're actually criticizing the complex global financial system, because r/ethereum told me they're basically one in the same.
How many mortgages are settled at any level of the "financial stack" with DeFi? None.
How many bond payments have been paid out at any level of the "financial stack" with DeFi? None.
How many registered securities have been traded with DeFi handling any level of the "financial stack"? None.
If you want to use your "financial stack" metaphor, DeFi is like using a bluetooth smart dildo bootloader as the back end for a full stack web application. Sure, the stack you speak of exists, but there is nowhere that any programmer would ever seriously think to put that thing.
Stop arguing semantics and actually point to a legitimate use-case that someone outside the crypto space would have for DeFi (even if it is at a "lower level" of the fin stack).