Freedom! Although I have no regrets. pmaitra If that will provoke, I will re-offend.
Now about the tanks. We're talking about modern warfare that takes place in Europe. Today, against Russian attack - tanks in the trenches, still quite effective.
Both parties are applied in large quantities ATGM old generation, so dig in a tank in front of the projection has a good protection for the front projection and its sector for defense.
The number of ATGM old generation is huge and they have been successfully applied as the Ukrainian army and the Russian-terrorist forces. Old generation ATGM can apply even new modules, so the light infantry battalion can stop the attack of the infantry battalion with a company of tanks.. Modern warfare less technological than you describe here.
Application corrected munitions does not mean a complete defeat armored vehicles. And coalition forces in Iraq, and the war in the East of Ukraine does not only applies correct artillery. One artillery shell can replace the usual 50. However, the percentage of their use is small. Largely spent shells. that had accumulated during the Cold war.
Russian army has ATGM, which are easily overcome by ERA of the old generation, but Ukrainian tanks now retooled ERA "Nozh -L"(Knife),which was put into service only in 2013.
The tank cannot be invulnerable, but significantly increases its protection.
@Khagesh On the basis of your logic, you must first abandon helicopters and aircraft. Because it costs 20-30 million. And its missile can shot down over 50-100 thousand.
@jouni Smart missiles are good and the Russian army and the militants can't do anything now oppose, therefore, Russia is actively trying to block the delivery of such weapons to Ukraine. There demonstrative video where Swedish grenade launcher tears off turret T-72. However, the tank is not protected by ERA. Russian tanks can protect the upper projection using the EPA's new generation of "Relict" or "Cactus".