Times have changed, and human behaviour has changed with the times.
Go back to ancient history, when I started wedding photography, 62 years ago . . .
Almost everyone got married and the vast majority were married in their local church, and a fairly large % attended that church on a regular basis.
The vicar would usually know the couple, and would always know the photographer, who would be a local full-time professional, there would be a relationship. The churches performed a public service.
Very few photos were taken at weddings back then, and the only indoor one would be the mock signing of the register, using flash. Photos during the ceremony just didn’t happen, and pretty much couldn’t because, for decent image, quality we had to use 100 ISO film, and there wasn’t enough light.
That’s all now changed beyond recognition.
Some of those changes have been driven by digital photography, which now allows high ISO settings, which means that there is always enough light – we may say that we’ve had digital since about 1990, but the early DSLR cameras performed very badly above 100 ISO, so the changes started to happen a bit later.
Vicars etc are now far less likely to know the couple, so they are less likely to care about upsetting them if they don’t allow photography. For churches, weddings are now a major source of income
Photographers are now far less likely to be full-time professionals who only work in their own local area, and some of them don’t care about upsetting the vicar, there’s no relationship to protect, and some of them are just ignorant, unprofessional and rude anyway. And photographers may get p***ed off by the behaviour of guests, who will take photos all through the service even if the vicar has announced that no photography is allowed, so the photographer may decide to ignore the vicar and take photos anyway, which just makes the situation worse for future weddings.
I think that the answer is for the photographer to have a quiet word with the vicar just before the ceremony and ask what is and what is not allowed, many vicars will allow a pro photographer to take photos from one fixed position, if asked, but some won’t and so some photographers won’t ask and will actively keep out of sight of the vicar. This makes sense from
the photographer and the couples' viewpoint, but makes things worse for future weddings.