I think these kind of systems are cool, though i can also see them putting some limitations on yourself as the maker / seller.
A plus is of course they blend in so well, i would like that as a fan of stealth, even if i have never had stealth as i most times had several systems on my windscreen.
But as a plain dashcam user stealth is very much what i would like to have.
A minus would be as they are so brand / model dependant in relation to your car, well you can not sell them to just everyone, for instance my French made Citroen C3 is not supported.
I am not sure it is possible, but i was thinking for cars like mine with a fairly small sensor island on the windscreen, maybe it would be possible to have a slightly larger generic " shell " that sould host a system you could fit on top of the existing sensor housing.
But i am not quite sure if differences in windscreens in general would make this a no go.
Such a system would of course also need to have some aids in it to determine what cut out to make in the generic shell so it would still fit seamless with the existing sensor island, at least when viewed from the outside looking at the windscreen.
Also ventilation of system and not forgetting things already there in the original sensor island.