Don't assume he won't carry a M19 or M66. Life is about choices, and today's choice may be that cool M10, maybe tomorrow a M15. Nothing wrong with an appropriately loaded .38 Spl in the hands of a competent shooter.
I have a nice 2 1/2" M66 that is an excellent shooter, and I carry it often, but sometimes I feel like being nostalgic, so I carry my 2" 4 screw M12. Or my 2" M15, or any one of my other revolvers in calibers from .38 Spl to .44 Mag. I even carry a Glock (gasp) sometimes.

It's nice to carry a Classic sometimes. Hang around a while and you'll understand.

All the best,
Jim