A tank is certainly more useful in the middle distance than at extreme range, or in tight spaces, there’s better choices of tool for those jobs guided artillery

A tank is certainly more useful in the middle distance than at extreme range, or in tight spaces, there’s better choices of tool for those jobs guided artillery/rockets at distance and heavy auto-cannon clad infantry fighting vehicles like in the city. But not all warfare exists in either of those ranges. Tanks are great at assaulting enemy hard points, taking fire away from supporting infantry who can move in and cleanup the position after the tank has suppressed it or broken it open. It’s a heavy weapon of mobility and manoeuvre on the field. A tank’s role is that of heavy cavalry, designed to intimidate and break defensive lines in a charge across contested territory and to provide immediate direct fire on a target in support of advancing infantry. As the modern rifleman company is the descendant of line infantry of old, the tank is the descendant of the Cuirassier.