The technical side of wedding photography is simple. A photographer needs plenty of light. A camera is also not an eye. What a person sees well in low light is just dark to the lens of a camera. Churches are notoriously dim, yet that is where most weddings are held. A wedding photographer could show up with enough studio lights to make the images shot in the church incredible. However, those bright strobes going off would be a distraction.
The limitations of the best camera are why the bride cannot have it all with wedding photographs. If the light is too low, the photographer either needs to add light or open up the hole (aperture) in the lens. If the hole in the lens is opened up to let in more light, it is not possible to focus on the entire wedding party bunched up in a group. The speed of the shutter can be slowed down, but then the tiniest movement shows up as a blur. This is why most weddings have a few mediocre images taken in the church, and the best shots taken outdoors.
One solution to getting extraordinary photographs inside the church is to stage a professional shoot. The bride and her entire wedding party gets dressed up as if it is the wedding day. The minister would also have to be present along with any family members that are going to be in the wedding photos.
The photographer shows up with enough studio lights and assistants to properly light the interior of the church. This is actually a must where architectural elements of the church are desired to be incorporated into the wedding photographs. Everyone who is to be photographed needs to understand they are there on a mission to be professionally photographed. Posing and smiling can quickly become tedious, but remember this is a gift to the bride.
Everyone has seen professional photographs that are jaw-dropping. Those photographs were planned. Every element in the photograph from the angle of view to the light on the subjects was planned out. A bride can actually have wedding photos taken indoors that are stunning, but the photographer would have to be free to treat the event as a controlled photo shoot. That level of control does not exist on the day of the wedding.