You appear to be effectively asking for a heavy reconnaissance vehicle (what the US calls Cavalry) and saying it's a tank.
Also, everyone who is anyone in terms of artillery can already crack everything up to the aforementioned CNT-based composites with extant howitzers. As a matter of fact, the US was already using artillery to crack tanks in WW2. The reason why the US never fielded heavy AT guns in great quantity was that their numerous howitzers were already filling that role. As for ADS, they can't exactly slap an 20mm rotary cannon on main battle tanks and still have them function as tanks, so without going with an armored corps of nothing but Maus-sized tanks you are limited to the shotgun-style or reactive plating ADS which are designed to stop RPGs (and maybe the comically slow TOW) - not 120mm APFSDS or 155mm HE shells.
HVATMs only refine an extant threat, they aren't real game changers either; at the ranges they are viable ADS doesn't really help anyway, their main advantage is that the firing vehicle (Helos, for example) doesn't have to expose themselves for as long. This is also a sort of useless development since Russia already had ATMs that were nearly immune to non-Russian ADS', so they are just increasing the cost of their own munitions for no discernible gain.
>One more thing to consider: the turret receives most of the hits, especially because tankers are sensible enough to prefer hull down positions.
Turrets receive the most hits because it's the easiest target to hit with the highest chance of causing severe, mission-killing damage.
Knocking out the turret eliminates the threat that the tank presents, knocking a track off or putting a few holes in non-critical locations on the hull will too often leave the turret operational and still a present threat. Even with HEAT shells.
Hull down is not really as effective in tank engagements anymore due to the prevalence of local level reconnaissance, both aerial and ground, that allows for flanking or improvised ambush engagements with attached infantry MANPATs forcing abandoning cover. It's excellent when you can get it during a snap engagement, but it does not aid when the enemy has enough time to go around you or can afford to wait you out for artillery or air strikes (which are the US' two preferred methods of cracking tanks to begin with).
>If unmanned turrets are the future
The US experimented with unmanned turrets back with the TTD. Loved the thing, but eventually turned it down as an evolutionary step due to its limitations.
First off, it's prohibitively expensive, as Russia is finding out.
Secondly, it requires far greater than average levels of mechanical know-how to maintain, which is rare for an army to have in the field (once again, ask Russia how those dedicated mobile Armata depots are going, you'll find out not very well).
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