I don't know, Homestuck feels really fundamentally different from PS to me, even at that point. I mean, Homestuck basically entered a whole different world with John and Dave's first conversation, giving the characters voices and thus personalities. The story inevitably became character driven rather than just the random madcap shenanigans of Problem Sleuth.
And it's not that I dislike PS, I think it's awesome. There's just a world of difference between it and HS.