I speculate that what you're talking about involves casting with a spinning rod/reel.
IMO using 30 lb. braid or under casting less than a 3 ounce lure - you won't need it (assuming the drag's set properly.)
If you're casting 4 ounces and bait, use a shock leader, and you won't need finger protection.
if you're casting 5 ounces or more + bait on braid or mono.. then perhaps some finger protection might be in order. There's my $.02