For what it's worth, I don't see the important point about barbed / barbless being relevant? If you hold the leader while trying to release a fish it will thrash about whether it's barbed or not. After all, it doesn't come off when you keep the pressure on whilst playing it does it?
I've tried releasing fish without removing it from the water and when netting it and removing the hook on the bank and I much prefer the later. Providing it's laid on damp grass it's easier, in my experience, to remove the hook when it's lying still on the bankside, than thrashing about in the water. The fish need only be out of the water for a minimal amount of time.
If the water is more that a few inches lower than the bank it can be extremely difficult without a net.
Also, using a net, when releasing the fish you can let i recover in it. Without it if it goes belly up out of reach, what do you do?
Having said that, the most important thing is to be careful either way and you should do whatever you find most comfortable.
ps. I would like to clarify that I didn't mean that it doesn't matter whether you use barbed or not when C&R, obviously not.