I think you're confusing standards with compatibility. Standards are agreed-upon rules and conditions that ensures things work globally, like fuel quality or audio recording. Compatibility is an accumulation of standards that work independently within one unit.
Without standards, somebody can design a car that takes up more than one lane that s/he wants to use on the highway, which would be dangerous. Without compatibility, a left-hand drive car can't be driven in a right-hand drive country.
I could think of two reasons of why compatibility is important for BD players:
1) It helps the consumer in making a purchase. You see a BD player and just know that the standards of DVD, CD and BD is there.
2) The cost differential in making players with differing standards is just not there. It may also be harder to set a price for a range of features for a player.
fuad
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