Marc--I'm glad your bride saw the value of your candid over the formal, but with my clients, I would not be so sure the candid would make it into an album, particularly if there were limits on the number of images going in. We can only speak from our own experience and clientele, and that's where I was coming from.
As for the dim churches--your point about Leica rangefinders coming into their own in the 30s and the Decisive Moment era is exactly my point. Wedding photographers were not using them at weddings, for whatever reason, I don't know. Probably felt the quality was not sufficient (35mm) and the general public was not ready for that kind of treatment of weddings (?). The dim churches comment was in reference to using medium format with slow ISO film and possibly not having the luxury of photographing an arc of action (single shot camera). Even if using a Rollei with a Honeywell Strobonar, it was probably considered wasteful to use up a roll of 12 shots following action. I've seen contact sheets from Decisive Moment photographers, and they usually shot a series of frames before and after the Decisive Moment, not discounting the skill necessary to recognize THE moment and push the shutter button. Shooting in dim cafes, the film was probably pushed Tri-X or something (?), which would not have been considered good quality for wedding photos. The tripod comment--not sure what to make of that.
As for what else was shot--again, I can only speak from experience. When I worked as an apprentice in a photo studio in the late 60s, early 70s, I saw what the photographer shot, and I saw first hand what went into the album, because I prepared the proof books and albums. There were plenty of candids--very good, PJ shots by today's standards that never went into the albums. Shots just like your sample. I've even shot ones like your sample that never went into the album. Now, back in the 40s and 50s, I can't say...but I would guess that given the chance a photographer with good instincts would have taken the shot. All wedding photographers back then were not all robots (I would hope).
I also agree with William re using bursts at weddings. Of all people, I should be on the anti-Gatling Gun side, because I came from a film background, and studied commercial/illustration/table top photography, which demanded control and deliberate shooting. I still don't use bursts much, but I have deliberately tried to incorporate it at times and find that I have had good results, again, not forgetting to exercise the Decisive Moment zen techniques. I don't see why they can't co-exist. Why not use the best of all the techniques available?
Probably should be a different thread, but this is related to why people make the decisions they do about their wedding photos. I often think about those formals that wedding photographer love to hate. I personally don't hate them--both for themselves and shooting them. I find beauty in a well done formal. I love looking at the formals from my parent's and friends' weddings. Part of wedding photography is pure documentation, not only of what happened, but the way we all looked--the full faces of people, the way they stood, what they wore (in minute detail). To me, it is fascinating--even strangers' wedding formals. Because of this, I can see why someone might want to put the formal in the album over the candid. Of course, both would be better.
Anyway, I'd like to thank you William, for posting the question. I got a lot out of the discussion, and learned a lot, as always, from the excellent discourse following. And thanks, Marc and everyone, for making that discourse compelling, as always. Good meaty topic. The threads were getting a bit anemic lately.