Matt, I'm pretty sure that you've identified my problem. On the other hand, think about this a moment. If you're assaulting dug-in or entrenched units, engineers with cool toys could certainly provide you with an equalizer. Maybe I'm on to something here with ENG negating First Fire in these situations. Nah, of course I'm not.
Use the rules as written is my motto. Reality arguments have no business here.
2,500 years ago people worshiped cats. The cats have never forgotten this!