This part of the discussion was split from another one. The forum user @maui posted a screenshot of the wuerth electronic site that shows that wuerth offers ready made footprints (and symbols) for eagle, altium and cadence.
I agree that it is trivial to make library assets but it still takes more time than downloading a finished library from the manufacturer. Especially if you know you can trust the assets provided by that manufacturer (The eagle libs for wuerth are very well made.)