I don't think this has anything to do with the medium. You could create one track on a CD with all the songs, commercials included. But this will be so annoying

I don't think this has anything to do with the medium. You could create one track on a CD with all the songs, commercials included. But this will be so annoying nobody will buy it. If you don't like the commercials a producer is putting on the BD, just skip the producer.