Personal opinion...
I think that all of the modules have their place in "someones system" the beauty of choice here and the "modular" concept is that we can choose and build which ones we really want. The better part of it is that we have a guy like Paul who takes our inputs in future idea's of modules... and sometimes actually makes them... we also have the "flexibility" that if Paul doesn't have it or make it... and has no plans to do so... we have still other options in modules... thus keeping with the true concept of a Modular Synthesizer. try doing that with Roland or any other "big" company...
I probably wont own "every" module that is available... and I will own several of them that are... but that's just my ticket... I just really like it all... I forgot how much fun I had building things of intricate detail... I still have the 101 module in the pana-vise, stuffed with the 100k resistors... haven't even soldered them yet... but I am no hurry... I have no schedule to follow, I just want to finish them all correctly...
just my ramblings...
"pay no attention to the man behind the curtain..." "The great and powerful Oz has spoken." LOL.....