Status: OUT
The SOLID dependency chain (LSP→DIP→OCP) serves as the theoretical prerequisite for the GoF pattern ecosystem: behavioral substitutability (LSP) validates interface inheritance, which enables abstract coupling, which is the shared mechanism underlying Observer, Strategy, State, and the other composition-based GoF patterns — meaning SOLID is not merely compatible with GoF but causally necessary for it.
The SOLID causal chain provides exactly the guarantees that interface-inheritance-based pattern flexibility depends on
Depends on (SL): lsp-dip-ocp-dependency-chain, interface-inheritance-enables-pattern-ecosystem