I ain't a member of the Bar. I do have an old FCC license kicking around someplace. I suspect tcsnrayp is right though... companies want the synergism of like systems and software, and it's likely the current and past owners didn't use the same software to deliver the data.
In the interests of accuracy though, some current excoters integrate the RDS function... the BE being a prime example. I had heard the new Continental effort would as well, but I don't think it's hit the market yet.