I use woodburning twig stoves as an alternative to having an open fire, but I always protect the ground underneath, so by simply understanding the consequences of the action of putting such a stove straight on to the ground, I use common sense and mitigate it. Voila, no damage, no trace.
Sometimes all it takes, is to stop a minute, and think about the problem.
The way I solve a lot of problems is to work backwards in my mind.
I see no fire scar,
Why is there no fire scar,?
because the ground was protected by not putting it directly on the ground,
So what do I need to do to attain that?
Put something underneath, to protect the area.
What can I use to do that with?
1) Carry an old cake baking tin and put it underneath.
2) Raise it up on a home made stand(Kelly kettle)
3)Find a stone, or make a stone platform to put it on.
I think it's called critical thinking. I often solve problems by imagining the end result, and working backwards to the solution, instead of trying to push through a fog of problems with no idea where I might end up.
It was a way of thinking I was taught on a permaculture course, and I must admit, it instantly made perfect sense to me, and I often find a solution much quicker.
As for the problem of fire scars in those lovely wild spaces, the default thinking is, ban them and they will go away.
They won't.
So, what do we want to see?
People enjoying the great outdoors, and maybe sitting round a campfire having fun.
So designated properly built areas where people can go and do that, such as they have in American wilderness areas.
They can be monitored, and problems nipped in the bud early.
Meanwhile, the rest of us sensible lot, can get on with doing it properly, in peace!