I understand you can't meet
I understand you can't meet everyone's needs, but the only reason you wouldn't err on the side of caution when designing the sequoia with a lack of rear roll down window, and cramped interior, would be if there either a larger version planned, or the upcoming 4runner will be more offhand focused and therefore they expect some customers will be forced into the sequoia. Where things sit today, the new sequoia is in some awkward place between the current 4runner and previous sequoia generation where it is neither roomy enough for those who need it, nor as maneuverable as a smaller vehicle such as the 4runner which offers similar benefits. Could have been a great vehicle.