Also there was never enough work to run a full out bw lab. (snip) BW requires many different developers to work with each type film etc. In a commercial setting this is not viable to run one roll of film at a time and switch developers for the next type film.
Interesting comments with a lot of truth in them
The B&W labs I once used had very little traffic and I never understood how they stayed open. One was run by a guy who painted model trains all day and processed film by night. I once asked him if I was his only customer; he never really answered. He mumbled some nonsense about working for a civilian organization back in the 1960s who did "business" in SouthEast Asia and how he made enough money to allow him and two generations of descendents to "live the good life". He did good processing work for years, and then the quality turned lousy. He never did good printing... even his proofs were bad quality. He closed shop shortly thereafter. The other shop didn't process film worth a darn, but the kid sure could print. He could follow a printing spec "to the T" and put out a print quality that few commercial shops could even dream of. Often he'd print to my spec, but then offer additional alternatives that were terrific. But then he went out of business - not enough customers.
None of the labs are going to cater to B&W film by matching specific developers. They will use what they use... and it will either work "OK" or it won't. I've had reasonable success with the old standards - Kodak and Ilford emulsons. I started using Bergger and had some quite mediocre results. It got better over time, but nowhere as consistent as when I use Kodak/Ilford products. Anyone following "a system" or expecting absolute perfection/consistency will likely be severely disappointed. Workable negs/prints can be obtained using commercial resources... but that's about all one can reasonably expect.
For reasons I choose not to discuss in this thread, I have never developed my own B&W (even though I've been shooting since the 1980's). But it is becoming so difficult to get quality (or even consistently mediocre) commercial darkroom services for B&W that I'm buying film processing equipment and I'll be processing my own film soon. Even getting "workable negs/prints " is getting difficult!