To me, I think the ultimate use case is to be able to fire up two versions of pd in the same processing chain (take vst's in a DAW for example), load each one with identical patches, and have them controlled separately.  This would be a fantastic boost for the ability to extend what we can already do with Pd as an audio processing engine, separated from its native GUI. Locking may be necessary in places, but then that is extremely fast these days.

Of course, this all leads to the pdinstance being able to manage the symbol table along with Miller's recent changes, but what are the difficulties in achieving this? It seems like Miller tried and it was more difficult than what we are imagining.

cheers,

Rich