Yeah, you have a very good point with your argument. The members who had a heavier influence aren't really there anymore, and if we look at how Anathema has evolved, adding a heavier touch would almost be like regressing in sound. It's interesting if we compare PT and Anathema, because PT started out more soft, and their last couple of albums have been much more heavy sounding, meanwhile Anathema is pretty much the opposite. Anathema now is very uplifting, atmospheric and positive, and I have no idea how they could incorporate heavier riffs into that, I don't really know if heaviness would work with atmospheric/positive/uplifting.