Watching that bridge wobble
makes me very uncomfortable
with being indoors right now.
I can't imagine who I would react,
if my house started wobbling like that.
I think you're right, the cost of developing giant robot doesn't make sense given the challenges you have stated, and I am sure there are many more problems that could arise that we wouldn't think to consider.
I would certainly be cool, but it is more practical to have a tank.