Tungsten carbide tips took a lot of the trad sharpening away, but they were certainly brazing that sort of tip on some large saws in the fifties. Also the modern habit of throw-away handsaws must have almost eradicated that part of the business. Also the cheap and portable electric tools from the mysterious East. My garage is well stocked I'm afraid, so I have gone with the flow myself. Retailing those is firmly in the hands of the major Sheds, leaving little for the small outlets. Keith