Jim, having had further thoughts about this, I think that it really comes back down to the old one about horses for courses.
As a once working-lifetime " working pro" it's clear to me that format is not key to care and attention to detail. Format, then with film, as today with the digital choices, is surely tailored to the concept of best tool: which tool (format) serves the job the best. I had a set of both various Nikons as I did Hasselblads. The choice of which to use was always informed by the end product and how to get there the best way all round. Sometimes, it didn't even require thought: instinct provided the answer.
In fact, using the small cameras demanded even more care in all departments, from framing to processing, which should not be read to imply a slackening off of care using larger film.
Rob