There are many parts that can't have silkscreen underneath them. Even the small height of the silkscreen impedes how the part sits on the pads, so automated soldering becomes unreliable.
This is fine for hobby/hand soldered use, but on a production line it will cause problems. The component will rock (like a see-saw) on the silk screen and cause tomb-stoning, especially if the component was picked slightly off centre.
If it was ever needed to move a project to production, the footprints would need changing.
That's correct, I mainly focused on hand-soldering and hobby projects when making this library. I can release a version with silkscreen re moved from under the parts if people want it.
As others said, plus you can't see the silk when the component is placed, so anything under the component isn't too useful.
However, I like the idea of the PlCC corner numbers, but have to say that they are confusing: which of the two pads at a corner do they relate to? I think either a positioning adjusment or indicator line would be appropriate.
New update is here!
SMD libraries have been split into two variants, one is intended for machine assembly, and the other keeps the silkscreen under the parts for hand soldering.
You can easily swap between them by using ‘change footprint’ option and renaming the library in footprint properties.