The most important thing b far is the photographer and his or her talent. But equipment sure does matter. Especially with Weddings in the Hudson Valley. Upstate, NY Wedding Photographers like Aperture Photography have to deal with the darkest conditions with very rainy and cloudy days along with super hot bright days with shadows and glare.
By far the most important thing in a photographers bag is fast and weather proof lenses, It goes without saying they most be sharp and have great color. Pro camera bodies in last few years are just great. If you have the correct glass you can create a fine image,
To me and I know it is just my take on cameras only Canon and Nikon are suitable. Many good photographers do well with others. Like the Sony and Fuji mirrorless are fine cameras, but the lenses needed to do the job have just started arrive and they lack dual card slots for backup. In a few years I am sure the will be perfect.
I choose Canon for 2 reasons. They make the fast lenses needed for my style and I love the colors. Brides just look great and the time saved in photoshop is very welcome.
Again, talent is key, but the tools to bring out the talent sure do help.