An experienced professional who has BEEN USING A METER FOR A DECADE (or more!) or so knows: 1) HOW to use a light meter and 2) Probably learned how to set up his lights and get the RIGHT exposure--not by GUESSING, but by PROPERLY USING a light meter.
I don't think you can lay claim to either of those qualifications, 1 or 2.. In fact, you just shot your very first roll of film this month. And I saw your results. Lousy exposures, big-time. You proved my point nicely. By the time an experienced shooter, who learned with a meter and film, finally made it to the pro level, he did not need to rely on a meter. You on the other hand, muffed an entire assignment of your three kids with horrific exposures made on film. Horrible exposures!!!!
Too bad you did not have the knowledge of how to properly meter light. Messing up exposures on modern Black & White film is almost inexcusable...yet, you managed to do that. Amazing.