Sometimes things go wrong, no matter what is strapped on the tanks. Also when things are expected to go wrong, tanks are at the point. Not just in Hammer's Slammers, but also in Vietnam & Cambodia, where David Drake was temporary gunner on a tank in thunder run through town.
You've read about these things in books. Some of us have
lived them. Bear in mind that, whatever Mr. Drake's qualifications, his stories are fiction - anti-war fiction, no less. Furthermore, just because something was done in the Vietnam conflict does not mean that it's a good idea now, or even necessarily at the time. Strapping command-detonated mines to the outside of your vehicle
might be useful in a desperate moment, but it
will be a danger to your crew and supporting elements all the time.