legacy momentum is still a factor too for sure. its easier to move an old, industrially in use 16F84 to eg 16F18xxx or pic18F or smaller faster modern low power

legacy momentum is still a factor too for sure. its easier to move an old, industrially in use 16F84 to eg 16F18xxx or pic18F or smaller faster modern low power pics with minimal code changes. and MCC is pretty good ive seen a lot of critical timing code down to using the 4 clock instruction timing have to stay on similar devices to save rewrite effort etc