A couple of run-ins with the Ministry Of Crap Design:
First, set up my friend's Ortlieb back rollers to fit their Racktime TOUR
IT rack. The rack - which is otherwise excellent - appears to be designed to be exactly the wrong shape for an Ortlieb back-roller, with the lower hook fouling the rail it's supposed to be hooking to, even if you invert the hook runner on the pannier. Given that these are the quintessential pannier, it seems almost like an act of deliberate incompatibility. Managed to arrange it with the hook pointing upwards over the corner of the dog-leg, which is secure enough, but means that attaching and removing the pannier is faffier than it ought to be.
Then attempted to adjust their Magura HS11 rim brakes for pad wear. Unlike discs, this requires twiddling a twiddler. Which has a T25 torx head. So far, fair enough. Except the lever itself fouls access to the screw, so that you can't use a screwdriver or multi-tool (which is surely how most people have access to a T25 bit, particularly at the roadside) to do it. Managed to improvise with a sufficiently small Allen key.