Looking at it from my point of view, I fish only mono, and usually don't use any trace. Just straight to the hook, line strength depending on what and where I am fishing. 6 pound with nippers, 12 or 15 pound handline in the deeper water with fish or squid strips.
I use 20 pound clear, high abrasion resistance mono with ganged hooks while using pillies, it gives some resistance to abrasion, however, the teeth of tailor will cut it through anyway.
If you are fishing for bream in rocky areas, using light traces, the bream will quite often zero in under a rock.
Also remember, it you are using 10 pound line, mono or braid, and you use say 4 pound trace, your line strength is down to 4 pound, not 10 pound. That reduces what pressure you can apply in difficult situations, such as rocky areas.