The pre-canned libraries will never have the typical customization needed for PCB. The paste mask aperatures need sizing depending on what stencil thickness yo

The pre-canned libraries will never have the typical customization needed for PCB. The paste mask aperatures need sizing depending on what stencil thickness you use. Need vias under the QFN belly pad for RF or heat sinking purposes. Do those need tenting on the back side? They also may need to avoid the paste aperatures? How about solder mask relief? Copper defined pads or mask defined pads? Are the part centroids on the correct layer? Also the keep out regions, and 3D model? What I'm getting at is the footprints are more than just copper pads; that's the easy part. They will still require lots of customization, so you are better of just doing them yourself and building up your own library. Now having correct schematic symbol pinouts for that 1024 ball BGA. That is useful. PCB library vendors have come and gone over the 20+ years I have been an EE. Also, as someone else mentioned, the schematic symbols are defined by if you have a logical (digital) or physical (RF) schematic. For example, pin spacing should be such that bypass caps can be squeezed between. Even data sheets have multiple symbols for the same part in the same data sheet; Linear Technology is a good example of this. Anyone doing PCB professionally will make their own symbols and footprints. A hobbyist using free layout software won't pay $29 for a footprint.