The same is true in the ceremony. It is reasonable to say that spotlight will bring better effect, but spotlight is not easy to grasp, and it is not the slow shutter as you think. Generally, the brightness of spotlight can ensure a faster shutter speed. Note that it is not the normal exposure of the full picture evaluation, but the normal exposure of the subject within the spotlight irradiation range. That is to say, most areas in the picture except the main body are underexposed or black, and there is a backlight. Generally, it is used randomly with or without flash, and the effect of blind flash or no flash is too simple.
If you want to shoot a wedding, you should have an external flash. The internal flash has strong reflection and heavy shadow. In order to avoid the background darkening, slow synchronization can be used, and the flash mode should display slow speed.
Are you from Tianjin?