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Your parameters are very similar to my own. I do actual French press, with a water:coffee ratio of approximately 100:6 (by weight) ground course; I usually do 36g coffee with 550-600mL water. I find that water at 195F for 4.5 min yields a pot at my ideal level of extraction.
Wait, this was an added language feature? I would have thought that this would have been possible at the inception of the language just as a standard polymorphic feature. After all, isn't it the case that the child's overridden method is still returning the same type (in the eyes of polymorphism) as the parent's method, even when the child method's return type is a subclass of the parents?
I think the neat thing about this is the big suite of sensors that are probably very easy to integrate.
The device is too expensive, I think. Raspberry Pi and other mini ARM Linux machines can be had for much less (~$35) and offer much greater flexibility.
I'm not even a hardware person (at all), and yet this is way too much abstraction.