It isn't walking on the ground the problem. You can pay attention all you want, there's always a trip hazard somewhere, like stone, root, hole, limb, rope, vine, stub... Even a twig can be enough if it takes you off guard. Then you have a jerky / reflex move and you control nothing anymore.
I do put my foot ascender with the spurs at each dismantling, but I don't walk around with the spurs on. They stay where the rope is, even if it's just to refuel my chainsaw or to get a forgotten item.
So far, in 11 years of treework, I only made a couple holes in my pants
The onliest wound I got by the spurs is at a hand. An other great dumb moment !
At the bottom of my spurs, there's a steel grip to avoid slipping on the bark (horizontal limbs). Some dirt was stuck here and I loosened it with a nail. to remove the wet debris, I had the bright idea to tap-tap with my hand. I realized very quickly that that will not end good, but the order to the muscles was already sent and my palm landed on the spike. Ouch !