This.

Unless on a red-eye or a last-minute flight change/upgrade that leaves me in the window, I'm always an aisle traveler in F. I put my laptop bag in the middle on most flights because it has trouble fitting under the aisle--and I'm also 6'4". I've never had a pax in the window complain. In honesty, most of them board after me and seem to typically have a large backpack that wouldn't fit under the center anyway. But if the window pax asked if they could have additional space, or the middle space was already taken, I'd likely put my laptop bag in the overhead (I try to avoid that, leaving it for rollaboards--again, being considerate of other pax is the right approach).