Autoloaders allows for a smaller turret, smaller turret equals less weight, less weight better mobility and better mpg/kph.
You are heavily underestimating the value of an unmanned turret. Russia has built secret prototype unmanned tanks before the Armata was even created. Take into account how many years and money was put into the unmanned tank program and how much more complex an unmanned turret is. Do you think Russia would go through all of that trouble for nothing? Especially when Russian tank designers like to use simplicity and cost effective solutions. The unmanned turret is neither, so for Russia to put so much time, effort and deviate from traditional design indicates that there is an obvious advantage and a big one.
The Armata can not be in the same class as any NATO tanks just as the F-22 can not be considered in the same class as legacy fighters. The unmanned turret gives the Armata large advantages that no tank with a manned turret can make up for. The first is survivability, if the Armata's turret is breached the crew will not be harmed and the tank may even continue fighting if no major gun components are damaged, the same applies to the Armata's hull because the crew is isolated even if the hull is breached the crew will likely be unharmed. If any western tanks turret is breached then the crew either is killed or so badly injured that the tank is out of commission. The same thing applies for IED attacks; there are plenty of photos from Iraq of Abrams getting their turrets blown off by IEDs which obviously kills the crew, if the Armata's turret is blown off the crew will not be harmed. And of course there is the weight savings, some NATO turrets weight over 20 tons, take into account how much weight the Armata's turret will save and the benefits of that. With all of the weight saved the designers can use extra armor to protect the hull and still remain lighter than many other tanks while have similar or even better protection.
I believe you are talking about an ammunition storage bustle. That is totally different from an unmanned turret and the Armata is said to have one to. Tanks like the Altay still have manned turrets. The crew is spread out throughout the tank, meaning if the tank's armor is penetrated someone is either getting hurt or killed. The other advantage that the Armata has is that the crew all sit together in an armored capsule, meaning they can even
survive if the hull outside their capsule is breached. The only part of the hull of a western tank that is isolated is the engine compartment.
The armata is said to have the Afgahnis active protection system. The previous active protection system was the Arena as you can see in the video it is real and it does work.
No operational tank has an unmanned turret. Read my full post explaining its advantages and how its completely different from a manned turret. And thicker hatches indicate thicker roof armor, thicker roof armor protects against top attacks from RPGs and anti tank rockets.