Yes and any decent manufacturer (like Renault claim to be) would recognise these at the design stage and change the design.
Try telling Porsche that. The 911 (996) engine had been around for 8 years and a small number were still failing when the model was replaced by the 997 because of a design problem with them. Manufacturing costs and the fact that it is cheaper to replace a few under warranty than fix the problem at the design/manufacturer stage.
Not so with the new headlights requiring wheels to come off to change a headlight bulb. You seriously think that was an accident Lag?
I'd blame NCAP, aesthetics and manufacturing costs before a manufacturers desire to screw a punter for a few quid for changing a bulb. After all most people would go to an indy if they couldn't do it themselves, not a main dealer.