In general, one thing needs to be understood here. The amphibious operation now, in any case, will not be like an amphibious operation, say, to take the island of Iwo Jima or Shumshu. Then it was possible to land the heavy machinery. Now in order to do this, it is necessary to have full initial control over the landing site. And it is incredibly difficult to do this in the case of approximate equality of forces. Aviation in modern warfare can practically not act. And if you load the tanks into the LCAC and send them to the coast...... When there are 1-2 kilometers left to the shore just one or two old rusty T-55s come out and after a few tens of seconds all the LCACs are at the bottom. For this reason, we are no longer building new БДКs. This is a positional deadlock by analogy with the 1st World War