Say what you want about the new gun but the side armor has always been quite lackluster compared to the ST-I a tier lower or more importantly as a super heavy with a larger side than a E-100 or Maus. I can say the same for the side of the Type 4. Now it can absorb the HEATz with the tracks like never before.
Sure these results might happen less on live server but anything can happen.
Not sure on how to fix the gun problem of "pay 2 win" but here is a bonus video.