I agree to a point. When I was in college the day after indoor ended ALL workouts were outside. If the schedule called for 12x400 @ 63 you were doing the workout outside no matter what. 5 inches of snow on the track you were running. Sleet, hail, downpour? You were doing that workout even if it ended up being 10x400 @ 66. The only thing we didn't run in was bad lightning. Even then, I remember doing tempo runs with scary lightning all around.
I actually like racing in rain. Downpour? No, but average rain I don't mind. But when you've done workout after workout in nothing but bad weather, come race day you're thinking "I've got to run in this again?" The more you run in bad weather the more you learn to hate it. But it is nice to get out once in a while and run in uncomfortable weather.