as a tall person i always end up with a couple of inches of spacers under a stem, and a riser bar. this leaves the fork steerer much longer than it could be if i used a rising stem and flat (lighter) bars. there would be less steerer to twist along its length, and less steerer to flex around the bearing points and loftily held stem. if it wasn't for the lack of cash these days id be trying out a steep stem and a flat bar, and i suspect saving weight and losing some noodliness. (i weigh 15+ stone without any gear on…)
apart from a slightly longer stem, this seems logical yes?