I hunt with both feet on the ground for several reasons. I've had much success over the years stalking (slow movement, stop for short period, listen, watch, etc.). I find it a much more interesting hunt than stationary up in a tree for hours.
It's much safer. I can't count the number of people I've known and/or heard of 1st/2nd hand who've fallen out of trees (e.g. climbing up/down or before they were secured) broken arms, legs, pelvis, back, kneck, etc. Even if you're teather with a strap, should you loose you balance, what are you going to do with your loaded gun (if firearm hunting) while you try to pull yourself back into the stand? That's not for me.