Oh all right . To put it another way; you don't need dust extraction with a hand saw. Though frequent sweeping and hoovering would be good - you get a bit of dust but most of it is crumbs. Not having a motorised tool blasting the stuff about is helpful
Thats a better way of putting it, you don't need dust extraction with a handsaw because the dust just goes everywhere, with a tracksaw and dust extraction the dust is removed at source.