Manufacturer teams still holding the advantage with the Rube Goldberg engine formula. Reliability still a key engine metric, and Honda/RBPT still struggling in that regard. Fuel pumps and lines seem like odd failure points, these are supplier items. Think of the first RB era, were they suffering engine DNFs so often? At that time they had simpler engines that were easier for the teams to manage. Rightfully RB've resented the current direction the past 8 seasons, they're the main team during that time punching above their weight in the sense of being a non-factory team.
It's good that Ferrari have finally caught up but its a pyrrhic victory. We're stuck with these Euro 6 track engines for a while now. From vroom to zzzz.