That can be easily wrapped if you really want piano black but maybe they'll give you the option to add more piano black interior trim. But does it really matter? What's under the hood and how it drives matter.
Considering I'll spend majority of my time looking at the interior trim.... it totally matters. That's like saying you'd take it with manual everything and cruddy cloth seats that are lemon-lime coloured...
Well, when you put it that way... I've sat in worse cabins than the Impreza Sport's and small things like a little less piano black than I'd like wouldn't bother me too much. What matters more to me is the functionality of the console, where the buttons are placed and what the cluster looks like. So far, that aspect of the interior looks good and most of the daily use buttons are on the steering wheel.
It's really not a lot, about the industry average I assume as other cars I've looked at has around the same amount of buttons. If you're currently driving an older car, the extra buttons could be a bit overwhelming but you'll get used to them. You'll probably only use the ones on the steering wheel on a daily basis anyways.