I have used song mode on other sequencers to create more elaborate songs with Elektron instruments. It works, but the powerful implementation of parameter locks gets somewhat lost then. They seem to behave differently when triggered externally, at least from the sequencer I have used (mainly the Deluge and Pyramid, for the purpose). So it proves the point that to make something better, you better be careful not to break what’s already awesome.
The blackbox approach, which @aloud echoes nicely by confirming this is an Ableton thing to begin with, has that thing going for it as well that it’s very live friendly. You can intervene at any point to improvise and jam with whatever part of the song you’re in, so it’s not a linear, Pro Logic-approach - it’s just a much more elaborate approach to pattern making that allows for structures that remind of song writing, including the aspect of improvising when you’re just feeling it.