It’s not just weddings, IMO. To me it’s really most any shoot that you are getting paid for as a photographer. But my rational might be different than yours.
In my personal opinion, the vast majority of clients (consumers…. Not necessarily persnickety, professional “art directors”) would be totally happy with images from a current generation smartphone —- IF they DIDN’T know it came from a phone….
Perception of value is key: “What a minute. I’m paying you $x to shoot my engagement photos in this park and you show up with some reflectors, lights, and an ……. iPhone? WTF?.”
If the typical client could be blindfolded (which is not possible or the images would look more like BDSM rather than an engagement shoot… hmmm… maybe a niche there?), I think that they would LOVE the images that come out of the smartphone (raw, processed, and delivered to the client). Why do I say that?
For some types of work (good light, outdoors, hang a scrim to diffuse if needed, use a profoto B10 as needed, etc) I honestly think that clients would think the resulting smartphone Images would be “awesome”. But, when they aren’t blindfolded, I’m thinking that they would equate “smartphones to my 17-year old cousin Jeff” and be quite unhappy with the “value proposition”. …… “Jeff would have shot it for free”……
A client showed up at my studio years ago and I was planning to shoot with my Leica M9. The 25 to 30-year old client was unhappy with my “old, toy camera”. I had to assure her all would be fine and promised a refund if they weren’t “great” images. In the end, client was totally thrilled and I got paid. Perception matters sometimes more than anything else.
At one time, 35mm cameras were thought of as toys. Clients wanted to hire pros with “real cameras” (I.e. MF) because, after all, “my uncle Warren has one of those ‘new cameras’.” Perceptions changed over time. They may or may not with smartphones too (which is, I think, what your post implies).