I see the plus is in the MIDI sequencer - with the Q Link knobs you could map and automate the CC of an external instrument. The software allows around 20 min of recording per sample. A midi sequence has no set length.
It has a configurable mute parameter i.e. mute sequence after 1 bar etc. So one can start /stop multiple sequences from the machine. It has scales, progressions and chords, that is quiet helpful. Also Overdub recording of sequences.
You could quickly iterate a lot of variations.
The sampler also has the possiblity to run looping with replace , and could insert FX, that sounds like a through track on the octatrack. I would think the midi sequencer alone would be worth it. I dont have read about routing an LFO to a midi CC yet, but i think the manual of the touch will cover most of the usage of the mpc live.
Also midi learn is not yet clear to me if its supported or not.