I think what he is saying is that for your intended purposes, i.e. riding on the road, a road bike would be a better bet than a cyclocross bike. This is assuming that that shop stocks a road bike that can fit all the accesories you will want for commuting. Fwiw, cross bikes only recently became commute type bikes, and that was because road bikes were too focused on racing. Proper cross bikes don't have fender mounts, rack mounts or water bottle mounts at all!
Which would make for a terrible commuting bike...