Because they're light enough while not being overly light? Chestnut that is.
Yeah, too light for my taste and I dont really like the texture on on burned chestnut but that’s just me. Ho is very plain Jane and too light for my taste. Since I like handle heavy and Yo Handle make sense that I like heavy and dense wood for my selection. For Slippery, I know some Ebony could be really smooth and slippery (Gaboon Ebony) but my Hinoura is one the best handle that I have and not to slippery (Makassar Ebony)I like forward balanced knives because it feels like the knife is chopping with its own weight, so I like light handles. The dense wood handles usually screw the balance too much. And ho and chestnut are grippy while dense wood could be slippery especially when they are polished. Being slippery might not be a problem until you have oil/fat or blood from fresh meat on your hand.