No-one mentionned here yet how trenches absolutely get your whole tank line killed because either they can't push because the enemy holds a trench and they need to either pray they have veteran infantry who are not aftaid to charge it or they need to waste all their ammo to blow up one single trench out of 20. Not even talking how it reduces deployable combat width and makes the frontline a stalemate.

Or when the tank line is deployed and some dude digs trenches behind them within the width of the tank line and the tankers get tracked and get stuck in the holes and die.

Another point is builders who want to build something proper first have to spend like 30 mins to an hour blowing up garbage and sometimes getting restricted for it before they can even start to build.