I mean every single other MBT tank in service other than the T-72 and T-64 has a better reverse speed than it(including the T-80 and T-14) because shooting and scooting matters. 4km/h is pathetic. It's not 1965 anymore where Soviet tanks are expected to suicidally charge and never reverse.
The T-55 and T-62 have better reverse speed. Let that sink in.
Russians see the tank as the modern cavalry. As such most tactics boil down to charging forwards, preferably at the rear or flanks of the enemy, and with speed and aggression to inflict decisive shock on the enemy and break through his line, like the cavalry of yore. Russians don't really do static defenses much, since even in a defensive posture they prefer to husband the majority of the tanks as a mobile reserve for counter attacks and the fact that a static target is an easy target for airpower and artillery.
In any case, the minority of tanks that do get allocated to hold static positions can make use of the integral dozer blade (standard for every Russian tank, a rarity in NATO ones) to dig several firing positions. They can then quickly cycle through said positions in a sort of caracole in defilade, appearing in a keyhole randomly and firing every now and then. This is vastly superior to the motionless hull down since a constantly moving target is exponentially harder to hit with artillery or air strikes, which the Russians do plan on using vigorously to punish their opponents that rely on such mundane tactics.
The T-14 is a special case. The MBT and the IFV were both required to have the same power pack and the IFV has to have the rear doors while the MBT the rear engine. The only real way to satisfy all requirements is to have a transmission with the same forwards and reverse speeds. Ironically with the T-14 there is zero need for a turret down position what with the unmanned turret anyway, so in theory it can just stay hull down indefinitely while patiently sniping at targets confident that at best the enemy can only disable the main gun or the optics, which are both very small and hard to hit anyway:
compared with the manned turret: