I don't normally get into these kinds of debates, but this I couldn't pass by.
Anderton
In many ways SONAR was ahead of the time with music production. Dim Pro could run four REX files simultaneously and pull out the MIDI files for jumbling long before Reason's OctoRex.
HyperSonic 2 crushed DimPro in terms of sound design and feature richness. I bought them both in 2007 with my first copy of Sonar. And today, the words "Dimension Pro" and "ahead of the time" look laughable in the same sentence.
The Matrix view is the only other view that resembles what Live can do.
So your example of being "ahead of the time" can be best described by a comparison to another product that's been around for years?
Every MIDI track has an arpeggiator.
An arpeggiator that cannot be automated or even disabled mid-song. So unless you intend to have an instrument play the same pattern the entire song, it's pretty darn useless.
And doesn't it rub you the wrong way that all these examples of being "ahead of the time" are from version 8.5 (2009) or older? And in many important ways, Sonar is still behind. No tempo track, no ability to auxes/sends next to the tracks that feed them (they're confined to a separate pane for no good reason - this limitation is unique to Sonar). ACT is a nightmare compared to controller bindings in StudioOne.
Remember this mess? It's still there!
Freeze still doesn't work sensibly (frozen plugins become bypassed, not immutable). ProChannel seems innovative as an integrated channel strip, but it's just a bunch of VST plugins underneath, except they're crippled in that they can only appear in Sonar and only in ProChannel, forcing constant switches between the track strip and ProChannel in the inspector (which, of course, require an inefficient mouse action). The docked console does not size itself cleanly, but is simply the usual mixing view that the user manually sizes. Neither Cubase nor S1 are this sloppy.
And all this while the company chases its own tail with features that become deprecated one release later. Like Beatscape. Or X2's track lanes. Or the 3rd-party guitar amp du jour.
Even without the bugs, when it comes to the core production experience, Sonar is behind.