I would be very interested in seeing what every rider would prefer to ride. On a sidenote, what is the point of riser bars? And don't say to raise the riding position because the same could be accomplished with a flat bar and spacers under the stem.
Well that's a difficult question. What was the first MTB riser? Insane Wayne and his Club Roost riser bar? The riser bar came to mountain biking because people realized that an XC riding position didn't really work for everything. The riser bar brought you up an inch or so without required a crazy high rise stem or a whole bunch of spacers under your stem. From then until a few years ago, every DH strength bar was a riser bar.
So, yes, there are other ways to get the right height. A whole bunch of spacers under your stem probably isn't the best. A high rise stem probably isn't the best. A longer head tube probably isn't the best. But then again, adding a couple of bends to a part that used to be straight probably isn't the best, either. But it looks more moto, so it's better, no?