Object 279...you thought it was all about the nuclear battlefield? You were wrong! (Vid)

Definitely gonna have to check out this series.  The portion of the vid where they talk about the hull armor was particularly interesting.  Seems that just like in WOT, heat rounds actually did rule the day.  Those tracks are interesting too.  Light tank type mobility with a ground psi of 8?  I think that's better than my truck (most trucks).

What doesn't the video cover?  If this thing was so damn cutting edge then why didn't the Soviets go forward with it?