Considering what else they did include, I would have expected to see at least one incarnation of a Cakewalk sequencer. The omission of Opcode Studio Vision is also strange.
OTOH, as much as I love Logic and even though I think it's the best thing since sliced bread, Steinberg's Cubase alone would have covered the basis for most of the other timeline-oriented sequencers. But since they included Logic and Garage Band, they have no excuse not to include Sonar, Vegas, Samplitude and all the others.
Where's Acid and where's Gigasampler? - these are the two reason why many Mac-based studio started integrating PCs into their environment.
ReBirth would have made much more sense than Reason, imho.