What is it about this forum where anyone who disagrees with your point of view and actually shows some actual subject knowledge gets stomped on?
So many armchair warriors!!!
HEAT rounds can be made in small workshops, provided the maths is right. They are at the most basic just another form of shaped charge. The real issue is, as I said, getting the maths right to maximise effectiveness.
Hell, you don't even need a workshop for a shaped charge! I know because I've made them with my own hands out of scrap found around the barracks (nothing you could stick on an RPG though).
Tanks are vulnerable to any number of tactics and weapons. They are not now, in the past, or anytime in the foreseeable future particularly difficult to knock out by a determined opposition. That said, infantry (and I was one of them) are just so much red mist if caught out in the open - it's up to the unit commanders to be aware of their units limitations (of ALL types) and avoid putting them into suicidal situations.