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We have the following guidelines:
The whole library is in metric. (You can always convert imperial into exact metric, but you can not always convert metric into exact imperial)
Since we are in metric, schematic and boards are designed in metric too.
Schematic thus has a grid of 1mm and pins are on a 3mm grid.
Cells/Geometries are also all in metric, and follow manufacturers guidelines. Pin/Pads are all metric too.
We work with one central library, and if a new update/revised component is finished in the library, the tool (EE integrated flow) will take care of showing in the schematic that the symbols need to be updated. In Layout you can update the cells/geometries either at package time or manually with the ECO functionality.
It is the duty of the librarian man to check and verify the components that are designed.
Hope this helps
Thanks Matija, this is helpful.