About the EBU R-128, there are 2 sides:
- The loudness and true peak measurement part.
- The recommended values for these measurement, for the broadcasting needs.
#2 is obviously not useful for CD Mastering.
#1 is absolutely useful for any audio production, incl. CD Mastering. Because the algorithms proposed by the EBU R-128 are universal, ie. independent of any broadcasting context.