The T-80 appeared in late 1943, and it was the result of the Astrov team trying to fix the problems with T-70. They knew that they needed to improve combat performance, because the T-70 still showed signs of weakness, such as poor armor, the constraints of a two man crew, and other lesser issues. When the team tried to fix the problems with the T-60 by making the T-70, it was generally successful, but the T-80 was a different story. The design seemed fine, but it simply came about too late - at a time when light tanks were being phased out. Ultimately, the T-80 was simply not good enough in 1943 to warrant its production.
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