RE: Why not wear a safety harness??
I seldom take a strong judgmental stand on "personal choice" issues, but on this one I will. Any one not using a full body fall restraint system while hunting from a tree stand of any sort is evidence that Forrest Gump's mom was on target when she said "Stupid is as stupid does." I cannot recall were, but there is a web site presentation by a former "professional hunter" who was not using a restraint. He fell. He is now wheel chair bound for life. This is an excellent presentation in support of using these devices.
As far as being in the way ... that is bull sh*& of the highest order. I am an avid bow hunter. I have used some sort of restraint since day one, starting with a "lineman's" system I bought at work. That was something like 1975 +/-. I have never had to pass or adjust a shot because of the restraint system.
As far as being "uncomfortable? More BS. Yes, the cheapo-s that come with stands now are not simple to put on and most are one size fits most. So what if it does not fit perfectly ???
As far as using the excuse that the "vest types" are too expensive ... whining now !! HSs and Seat-of-the-Pants brands are $100 or more. However, the "Tree Stalker" brand, which is similar to the Hunter Safety System can be had for about $70. Ameristep makes a similar product that is available for about $50. Is $50 too much !
You need a reason to wear one ? ... try looking across the table at you wife or kids or girlfriend, etc. Take a ride to a local spinal or severe head injury rehab center. That not enough, then nothing I or anyone else can say here will make one iota of a difference.