I agree and disagree with both of you as I learned with a combination of 283, Metz 45, photo floods and even construction lamps from time to time. I got by and did some good portraits. I now have pack and monolights with modeling lamps and really wish I had had them in the early years. The modeling lights make it so much easier and eliminate a lot of guessing or wasted film.
But......If you need to go cheap with a a couple of taped up 283s (gives a lot of light!) you can also set up a flood lamp right beside the flash to act as a modeling lamp. Leaves a lot to be desired but can be workable and better than nothing for the financially challenged.
Even my modeling lamps don't do a real good job of imitating the flash output so everything is a compromise.