Means, tanks should not operate without air-cover systems (Korkut/Hisar-A+) and an Hardkill + Softkill system. Not to mention, first step must always be air sovereignty.
For an example, you drive with 40-50 knots and try to hit a boat with a speed up to 30-40 knots. With a gun, not an easy job. Plus, the bigger the gun, the slower the reaction time.
Sure? I mean hitting a fast moving target (boat) if you also drive fast, is damn difficult. Not to mention hitting some targets (bunkers/cave/vehicles) on islands, only with gunfire could maybe not enough.