Thanks so much for your post and yes Charlie, your question was clear enough. I was unaware of the other string which shed more light on the real issue of initial caliper set-up and tuning.
Shimano was not thinking of hub motors when they designed the M-375, as the clearance to the inner pad adjuster is tight with a hub motor, clearly. That said, if the caliper is properly set-up during assembly (which it should be), a consumer should not have to touch that adjuster to adjust the brakes for wear. That adjustment would be done by tensioning the cable which can be achieved easily at one of the barrel adjusters on the lever or caliper.
I'll discuss with our product manager that is responsible for spec on the Dash and update if I learn anything new but thanks again for clarifying the issue.