I have commuted on proper road bikes, mtb's with slicks, and tbh what I have now is the closest to my ideal commuter. It is:
Hybrid alu frame with EBB
Flat bars + bar ends
8 speed Hub gear
Small disc brakes
700c wheels with fattish slick tyres
Full length mudguards
About 15Kg
Its mainly for my 6-10 mile each way commute – had too many "close calls" with the road bike. Also do a lot of training on it, generally 50-100 mile loops. The weight is fine when you get up to speed.
I laugh at fannies with cantis and v-brakes – they are shit in the wet, which this country is 70% of the time.