I seriously considered the P12 module for some time, but after demoing one felt it would overlap with my MM too much. Especially after loading the MM digibanks up with the free Moog and Oscar waves. Also for all the polyphony, just 2 part timbral on the P12 felt limiting.

As far as overlap with my A4, not at all. MM is its own beast, timelessly unique.

MMmk2+ with a DSI evolver will take you much farther than P12, and for less money.
Add a $200 Nord Drum 1 and you’ll be even closer to replacing what is lost in dropping the Rytm. MM has a lot of strength in that p-lockable midi sequencer.