Actually this does happen, tho' more rarely these days.
AnimEigo delayed their release of the Macross series for months due to
testing with a large variety of players in order to make sure their discs
played with all the models they tested them on. In one case I heard of
parental controls in some players would not allow a disc to be viewed even
tho' there were no features in the disc to utilize such controls.
Gilles Poitras firstname.lastname@example.org
Learning Studio, Exploratorium Museum