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@Bearlegged
I think it's a matter of trade-offs.
Whilst you may wish to protect the calliper, it would seem this will add complexity (and hence cost). A guard that only protects the disc itself (and the calliper itself can provide some protection) would seem to be easier to make.
The impression I get is that rotors do get damaged more frequently than callipers (though this based entirely on anecdotal sources, and your experience may well show otherwise). Bearing this in mind, I'd suggest that a simple rotor (only) guard would be easier (just a sheet of metal in one plane, no bending needed) and therefore cheaper to produce. If it does get a little bent, it could probably be bent/beaten back into line, and in many ways could be viewed (to some degree at least) as sacrificial protection - after all, your main concern is that your brake still works, not whether or not the guard's perfectly straight.