During World War I, tank warfare was still very much in its infancy. The priority at the time was about getting this new technology to work more reliably
German tanks in World War II - Wikipedia
IS-2 - the most horrifying heavyweight monster of the Soviet army
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March 2018 – Norfolk Tales, Myths & More!
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Super-heavy Tanks of World War II: Estes, Kenneth W, Palmer, Ian
Britain sent 500 tanks to help the USSR against Germany in 1941
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March 2018 – Norfolk Tales, Myths & More!
Against King Tigers, just how fearsome as an opponent is the IS-2 Heavy Tank? - Quora