The best tank killer is another tank. The bombs always hit the ground. Perfect plans aren't. The easy way generally gets you killed. The side with the fanciest uniforms loses.
Armored vehicles are bullet magnets, a moving foxhole that attracts attention.
If you are short of everything except the enemy, you're in combat. No plan survives the first few seconds of combat. It's easier to expend material in combat than to fill out the forms for Graves Registration. If you can't see the enemy, he still may be able to see you. Final protective fire doesn't.