I’ll qualify my free climbing, both in the past and now.
Back in the day (90s) at the firm I worked for the lead climber would often just lock his hands behind a small trunk and spike up for access, so naturally I copied, there was more than a bit of bullshit machismo attached to this practice...
For living a longer life certainly.
To be able to climb trees to a commercial level as you get older relies a lot on having a bit of luck with the genetic lottery.
Weight, joints (arthritis etc.) plus of course a desire and need to continue!
Some people retain strength and balance much longer...
The only time I got a serious pinch.
Husky 288 on a big oak branch caught the saw, after a short period of time (split second) the saw freed itself, bent guide bar, sore hip but ok.
My take, don’t have a breakaway, saw will free itself.