I have a light road bike. Real joy to ride.
However, for commuting, I use a cheap bike i can lock, leave anywhere. Since I commute in work clothes most of the time, I have fenders. Rack to keep things on the bike, not on my back(pack). It is also a joy to ride. Just not that fast.

Road bike is around 10 kg, while commuter is around 20 kg (40 pounds). If I made it any lighter, it would cost more. Takes a bit more effort to accelerate, but apart from that, no problems.