On a lot of carping venues there is mouth damage due to heavy rods tearing hooks out as the fish battles close in.... a lot of anglers rock up to small commercials (3 acres or less) with hideously overpowered rods (3-3.75lb) and big pit reels and the quarry is not much bigger than an upper double to a 20lber...
fish of this size can be landed on much lighter gear. Hell Chris Yates's 50lb'er was landed on a cane rod of about 1.5lbs test curve, so why anglers need 3lb + rods for 20's I don't know.... a lot of the damage is caused by the rods being too powerful to cushion a lunge under the rod tip and tearing a hook out of the flesh causing a lot of the damage seen... there are other factors, such as too tight a clutch, too fine a wire of hook... and worst of all lack of experience in dealing with hooked fish of that sort of size
There's always going to be arguments for and against barbs or barbless but it is noticeable how rod poundages have increased as the years have rolled on and instances of damage have increased...
there is also the case that with all the info on youtube and other media there are loads of "Instant Experts" out there who have had no progression as anglers, they just just dive straight in and walk out of a tackle shop with a trio of rods that could pass muster for spodding and reels that could wind a boat in, alarms that can and will deafen at 500 yards, bedchair bivvy and a s0dding mallet and Voila' you have an instant carp angler....