First, you can only use it during certain times of the year that won't start a big fire.
Second, if you have something growing there and you would rather that that something was not growing there, then shouldn't you really be growing something there that you want? Otherwise, you burn the plant and then it will just come back - now you have a chore that you have to do every couple of weeks.
The mission is to eliminate chores!
I tested that prototype all spring and summer in my garden. I also used it to slice through weeds that were encroaching into my gravel driveway. The stone in my driveway is hard-packed crusher run. I forced my hoe blade through the densly-packed stone and it sliced through the weeds about 1/2” down. This kind of work was, essentially, wheel hoe abuse, and I abused that prototype repeatedly all summer long. I can report that the tool took such abuse without complaint or ill effect.
Presumably a non-wheeled hula (aka "stirrup" hoe would also work.
For a road, I would use salt if the weed growth is widespread and must be removed, vinegar if the area is limited, or my hands if just a few weeds. Another useful method is a sheet of plywood or a tarp over the affected area for a week or so.
Caveat, I have never used a weed burner. This is a result of the research I did when I was considering buying one. No personal experience here.
These are not the droids you are looking for. Perhaps I can interest you in a tiny ad?
For the Love of Paw Paws Mini Manual - Kickitty-Kickstarterhttps://permies.com/t/76624/Love-Paw-Paws-Mini-Manual