Resolution is crucial to getting the best results while 3D scanning. Resolution is all about how much detail is contained within a space and will influence how well your 3D scan turns out in the end. Lower resolution and any artefacts that can occur in an image is going to be a major hindrance during the capture process. Remember, if your image has more details, your 3D object will, too.
While there are 8k cameras on the market, they are extremely expensive. In the end, it makes little sense to use an expensive, high-end video camera to increase resolution, when still images could be used instead. In every category, photographs are going to produce cleaner, higher resolution images for cheaper, too.