Sure also in big companies there are plenty of places for low performers to survive by owning some very small and rigid scope that doesn’t require any real end-to-end thinking.

In my experience distribution of engineer quality is even across companies, countries, ages and any other dimension we can come up. Certain big scale skills can really only be practiced at honed at large tech companies, but it’s always a small minority that actually make those things happen. Resume alone can be an extremely misleading signal.