even assuming the "side" armor exist, you are not suppose to take hits to the side armor.
most tanks in the world have relatively weak rear and side armor as a necessary weight sacrifice.
the panther is a tank with speed and acceleration on par with the US and soviet tank. Use it to protect your side from danger.
How often is a medium tank going to be 1v1? The point of the demostration is to show that the panther isn't exaclty worth it's price. For almost the exact same price as a P4 the T34-85 will win 1v1 +90% of the time but against the panther vs frontal armour it will bring the panther consistently below 40% health and the panther costs signifigantly more. And if the T34/85 gets the panthers side armour it will win roughly half the time ( 4/10 + 3/5).
A panthers AI is so weak it will lose consistently to rifles with double zooks if they're in green cover.
watch your own video. The panther won all ten of the frontal fight, and a good chunk of the them still have 60% hp remaining. 2 out of 10 got close to death but still won.