My definition of "efficient" is what others call "lazy". I use one format, one film, one developer for an entire series to simplify the similarity of the prints. Each series will take six months to several years and it is good to eliminate as many variables as possible. I make the final exhibition prints all at one time as well. When the technical consistency is easier, I have more effort to devote to the content delivering the message.
Now I have changed from Neopan 400 to Tri-X in the middle of a series but that is not a difference I can detect. Similarly I have changed 28mm lenses.