Maybe I was the only one suggesting it wasn't. I guess I played too much D&D as a kid and just always imagine that most game engines are built like that, where leveling up is a tier-to-tier event. It seems like there's plenty of randomness and enough complexity in the GE to make folks think that they see evidence of sublevels. But I remember being the odd-ball out in conversations I had about this back in the day as well. That said, it seems like there is evidence of sublevels in potential, which suggests they might exist everywhere. In any case, I don't think you ever need to base any non-training decisions based on sub levels, so I think the question is basically moot.