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Nov 28 2019
Shimming if often used in PL lenses that have a scale for focusing. This scale is calibrated with a target like a Siemens Star or a Test Sheet.
Companies like P+S Technik do this with a rig where you mount the lenses and you can measure the focusing distance from the sensor to the target.
Once this scale is engraved cannot be changed as far as i now and that's why people shim the mounts.
Other cameras have "back focusing" that moves the sensor back and forth.
Photography lenses don't have this scales so they don't need shimming unless you want to change the range of focus to allow the lens focus more at macro or at infinity.
I think it's the correct solution to have the possibility to shim the mount, because otherwise you may need to move the sensor or try other more complicated ways to move and align the lens.
Aug 8 2019
May 27 2019
it doesn't really fit here but as a small side note:
i stumbled over HDMI connector form Neutrik: