Tanks

ERA and APS basically made ATGMs obsolete in the 90s, its just that no one in the West is using these systems. In fact radar triggered ERA is about to make long rod penetrators obsolete too.

I don't know what the distant future is going to hold.

Any caliber warhead that contains sufficient HE to cause a chain reaction is hilariously unsafe in a light vehicle.

The enemy can use API machine guns to penetrate its armor and light off its own ammunition. In effect killing the crew as if they set off a satchel charge inside the tank. Everyone would be killed instantly and the vehicle rendered unusable.

In reality such a light vehicle needs orders of magnitude more protection for its ammo than even a MBT, which adds far more weight that no one is willing to see on their light tank. That's why Sheridan was such a failure, why BMP-3 is very dangerous to ride in, and why Buford was cancelled.

Armour will always have a place in the military, it just depends on who you are fighting.
You wouldn't send a tank against entrenched ATGM positions, but why send anything BUT a tank against entrenched infantry without ATGMs?
Or in another doctrine that may make this easier to understand:
You wouldn't send a CAS plane against a SAM site, but why send anything but a CAS plane against a bunch of IFVs?

Tanks have a special role. They take out infantry, even in heavily entrenched positions, by using their stabilized machine guns and direct fire HE weapons from what is essentially an all terrain armoured pillbox. As soon as you know the enemy has ATGMs set up and ready you switch tactics and use indirect fire weapons such as mortars or artillery to engage the enemy ATGMs.
Or, you know, you deploy a whole lot of smoke, drop a bunch of artillery shells on the enemy to make them stay in their hideouts, and have light infantry advance in light vehicles. As is standard procedure for attacking any heavily fortified position
I believe that ATGMs are the same to armoured warfare as the machine gun was to infantry warfare. It posed a massive threat until people found new ways to deal with it.

Retarded idea incoming:
Would binary explosive warheads be possible? Something that is only combined shortly before being loaded and fired? It complicates the loading process, but it would mean your light vehicles can hit harder than the enemy's ever could (unless they do the exact same thing, which cancels out the drawbacks somewhat anyway).

The Iraqi sarin shells used the rotation of the round imparted by the rifling to mix the binary precursors through centrifugal force. This would of course necessitate a liquid explosive, like PLX or something.
t. Not a chemist

Zig Forums designed this by the way

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Even putting aside the difficulties of mixing the catalyst super fast without reducing rate of fire, what guarantees that a penetrating hit won't cause the explosive to mix inside the tank anyway? The shell components would have to be in separate armored compartments. And that means a two-step loading process, which would reduce rate of fire by a lot. And the enemy's vehicle would be able to hit just as hard, just with less crew survivability.

My idea for a multirole fast support tank would be simple-
Idea is to have one for every 2 MBT, spraying soft targets with unending fuck you and making everyone else nervous.

First, it's not the HE that cooks off, it's the propellant. Second, if you're in a vehicle that's getting perforated by AP-I you're gonna have a bad time regardless of cook-offs. Third, if it's that big of an issue, wet storage and blowout hatches exist.

That is too complicated, besides there's nothing saying that an enemy shell couldn't penetrate canisters for both mixtures.
Best bet is making explosives more inert and more resistant to temperature, and then using them VERY SPARINGLY. Instead of making it a heavily HE warhead, instead make it heavily FRAG with very little explosives. Most HE warheads are just a thin

That's exactly what the Tunguska successor will be, except on a armata hull with the new "universal missiles" based on AT-16 Scallion