Crazy!
A little late to be shocked about CBM's bad decision making, isn't it?
Remember, when the A4000 was launched, CDROM drives weren't cheap, and IDE was still kind of a new thing, CDROM drives were actually mostly SCSI still. Making CD drive standard would have put the cost of the A4000 even higher than it already was. Main media at the time was still floppies, and they were plentiful, and pros already had networking. Both CDTV and CD32 use custom CD drives, because neither IDE nor SCSI drives were cheap at the time (and they were clunky as heck).
