Makes sense. Just thought narrower bars like these (come stock at 48cm) generally have less sweep.

For example Soma Late Risers are described:

"The nine degrees of sweep on MTB riser bars aren't as ergonomic when chopped to X#%$. The Late Riser is a medium width, shallow bend bar designed especially for street use. The Late Riser a medium width, shallow sweeping bar designed especially for modern urban applications. 6061 T6 aluminum. 24mm rise. 540mm width. 6 degrees bend. 270 grams."

Guess it depends on what you are comfortable with. Not sure anyone is doing any serious ergonomic research here...