Some of them do, for instance: http://www.microchip.com/development-tools/resources/cad-cae-symbols http://www.microchip.com/development-tools/resources/cad-ca

Some of them do, for instance: http://www.microchip.com/development-tools/resources/cad-cae-symbols http://www.microchip.com/development-tools/resources/cad-cae... But you're right, it would make sense for them all to do so.