I wonder if the buckling isn't caused by folks cranking the housing cap down far more than required and to the proper torque spec of 18ft-lbs / 25Nm. ... I guess folks forget it's the o-ring doing the sealing on the cap and not the threads.
If the cap is overtightened on those FCA cartridges, does that apply abnormal stress to the cartridge itself? On Toyota cartridges, and I assume most other designs, when the cap is overtightened, it bottoms out solidly against the metal base, so there's no additional stress on the cartridge (or the o-ring). The clamping force on the cartridge is determined instead by a spring. Foolish people have been known to put them on so tight they're very difficult or impossible to remove non-destructively.