I maid the switch from a MTB to a road bike. I also looked at the "flat bar road bikes" but glad I didn't get one. My main source of discomfort on the MTB was my wrist and hands. the roadie has so many places to put my hands it is just not an issue.
I never ride my MTB except to take the trash to the dumpster in my apartment complex and also when on dirt trails ofcoarse.