I had the same thoughts, and that’s part of what led me to the realization of my new 29" frame.
In my experience, handlebars that attach under the saddle are fine for muni.
For road riding, long & stiff handlebars are a real plus. This type of handlebar or specific frames are more suitable.
Not having the front bumper can be confusing. To handle easily the unicycle (mounts, stops, technical sections), it’s best to have the handles positioned close enough to you.
In any case, I think you need at least 2 positions to optimize comfort and handling.