Until you find out that a manufacturer decided to use a footprint which looks standard, but uses a custom pin numbering. The schematic symbols are right and so

Until you find out that a manufacturer decided to use a footprint which looks standard, but uses a custom pin numbering. The schematic symbols are right and so are the KiCad-provided footprints, but they are still not going to work together. But yeah, a lot of chip footprints are quite standard, or require only small modifications from those standard footprints. I do still have to hand-draw quite a few of them, but that's because my designs are usually quite heavy on relatively obscure peripherals.