I'd like to look at this seriously, and if I can, with a measure of innocence.
Here is the question-
If Medium Format and Large Format are Better, Why Do We Bother with 35mm?
So, test the premise before digging into the logic.
I met up with Bill Schwab on a quiet Dearborn day, and we went over to the Ford Estate, a short distance from our homes. Now, Bill and I both shoot afterglow and it was an easy choice to do his picture in the light that inspires us.
This is the picture I like, made at 1/15 @ f/1.4 from a tripod on ISO 400 film, with a 35mm lens.
I might have made the same image on 6x7 with a 58mm lens, at f5.6 at 1 second, although the depth of field would have been different. I might have made the image on 8x10 with a 210, at f/8, and the look would have been very much the same, and quite acceptable, save for the 2 second exposure. I'd have made the shot on the same film and developed in the same developer, so it would have been no struggle there.
But I think portraiture is really the document of the time the photographer spends with the subject,
and breaking Bill away from his picture taking would have made the whole vibe different,
and in this case, not as good. For he was making pictures, not posing, and I was watching him work (usually wondering "What IS he looking at ?"
In that instant the sun sunk the horizon and that sky behind him lit up, and he looked up from the camera, we made half a dozen pictures.
Another time, maybe we'll do it again, and I'll pack the Deardorff. But Bill would still need to be STILL for 2 seconds. And he NEVER holds still for 2 seconds.... unless a fellow collodionist doses him with ether. Seriously, following action with a 35 rfdr is one thing but keeping up with an 8x10 is quite another. At dusk.
But I know a spot on a beach in northern Michigan where I COULD shoot Bill with an 8x10, especially if somebody really tall would help me do it.
But it was better to shoot
this in 35, and I did, and the image is sufficiently good that it lacks nothing compared to an 8x10 neg.
Photography is all about NOW. It is URGENT. We take the picture right now, not tomorrow, not theoretically sometime in the future. There are two reasons for this:
1. All photographs exist forever in the instant they are made.
2. I might be dead tomorrow, when the light is better, so I'll shoot tonight.
For me, a portraitist who is inspired by liminal conditions, Medium Format and Large Format are technically and aesthetically inferior to 35.
The premise of the question is incorrect, and the question falls. For another photographer,
the premise MIGHT be true, and the question be answered differently. It is up to each of us to test the premise, but it is always going to be the picture that provides the answer, not some assumption about film size.