I'm 6'1 and around 250...but heading lower! I've been hunting out of high stands my entire life. As embarrassing as it is...I'll admit that until I had kids, I never wore a belt of any kind. That was about 7 years ago. I fell when I was young, but walked away and thought I was bullet proof. My kids mean so much to me that I now take tons of precautions.
I started with the single strap and now wear a shoulder harness. I always carry 2 screw in steps and a knife in my front pocket. If need be, I can screw in a step and cut the harness. Then alternate steps until I get down the tree.
Using good equipment and taking your time, imo, lessens your chances of falling...but there's always a chance.