I wrote in my original review:
"It will not be a good game for people who want an ad hoc quickie one-shot adventure with a "bring your own PC" approach."
If you believe that the "ad hoc quickie one-shot adventure" will feature brand new PCs, I'll accept your premise. If you're telling me that you could sit down with a group of strangers and cook up a workable party of advanced PCs that an ad hoc GM could challenge in a fun and effective way faster than I could do that task with a group of strangers for D&D, I'll disagree.
My direct experience is that ad hoc games are the least likely to be run with absolute new PCs, other than when people "just want to try the game". When experienced players gather, they'll have binders of PCs ready to play, or will be able to map out a character quickly based on prior experience.