My only experience with trebles is in the river pulling plugs for chinook. There’s no C&R going on because when you get one, chances are its hatchery and you might not get another. Diving plugs fish better with trebles because they balance the action better then a single. But I always got trebles tangled in my net using plugs and was thankful I never had to use them in the salt chuck.
I very rarely have fish take herring or anchovies deep so not sure what that’s about. If they do, they go in the box. Fishing bait in a river? Different story—-steelhead inhale bait, probably because they’re stationary and the bait is moving with the current directly into their face