The Winchester style safety is easily mis-used. 3 positions for it... fully engaged and locked is the safe position, half on is the unload the chamber position (best not to carry a chambered round in this position) and the fire position.
Thousands of times a half position Winchester safety has been accidentally disengaged. It shouldn't be used as a carrying position.
I use the half position for unloading, as is standard, but I also use it on stand as an animal approaches or on the final few feet of a stalk, when the shot is imminent... makes for a quick and easy "snick" to the firing position. I prefer a three position safety to a tang switch.