Personally I think MMC's stance on this is poor
Mogs are driven in the rain (sometimes very heavy rain) with the hood down, when touring can be left outside for days on end in poor weather, and as we all know, the hood when up can leak, never mind hitting a deep puddle at speed
Critical and sensitive electrics and their housings should be designed (and workmanship during install) to meet proper dust & water ingress IP ratings, especially when the owner is paying CX platform ££money
Rant over...
I agree, especially when you consider how well--established the principle is of potting electronics to keep out the wet. If Boyer Bransden could produce electronic ignition systems for motorcycles in 1969, I can't see it's beyond the wit of man to waterproof Morgan electronics half a century later.