I'm not a 'pump' guy, maybe with 2 change-outs I've become a 'pump replacement' guy. However I'll venture a guess that crud less likely to stick to, or grow on, stainless, thereby maintaining minimal clearance to impeller which crud could foul.

98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both