Batteries and sattelite/tower signals would have to be maintained.
Also, the more Tech in a mine the easier it is to spot. No, use as little metal as possible.
Not using mines is asinine. Might as well outlaw artillery. Yeah, civilians are at risk. Uhh, so what? Never seen the effect of a WW2 German bomb dug up in London? They still go boom.
Not using mines is just like telling homeowners that they cannot shoot some arsehole breaking into their home.