Using a break-a-way lanyard is there for your protection. You can replace an 880 Stihl, but how can you replace your time spent in a hospital room.
I had a 24" saw get caught in the kerf of a large log in the early 1970's just as it was going over. I was able to keep grip on it to keep it from crashing to the ground, but it bent the bar and chain beyond repair. I had it attached to a chain saw lanyard I made out of 1/4" 3 strand which has an ABS of 1,800 pounds. If the chain were more in the kerf and I lost grasp and the saw fell with the log, it would have definitely done some bodily damage. After that, I detached the lanyard before making a cut. Now that break-a-way lanyards are manufactured for arborist use, we have a company policy that states they shall be used for "all tools aloft", except hand saws.
Chain saws are attached to the harness while climbing, not suspended from the lanyard, but the lanyard is still attached to both the saw and harness to protect the ground personnel.
Take some classes on cutting safely aloft or learn how to finish making cuts aloft using a hand saw, with the chain saw stowed. There are chain saw cutting techniques that prevent the kerf from grabbing the saw chain.
The life you save may be your own.