1. Is Leclerc good?
2. Do you think any conceptual or prototype tanks seen few years ago can outdo Abrams?
3. (Mod material) is there Abrams model or entire asset file for Civ6?
4. How good Merkava is? I'd think Merkava's ability to climb Golan Heighs made this tank something Abrams can't do.
1. It's mobile and has a decently long gun for high velocity APFSDS rounds. The armor seems like a good composite of titanium and tungsten alloy in the newer versions, but I don't know how good it is. Tank armor is generally pretty classified, which makes it difficult for enthusiasts to discuss. The Leclerc's light weight might mean it isn't as well armored as the newest Abrams models.
2. Of the new prototype MBTs from the last few years, I know only of the Altay and the Armata (unless you count prototype upgrade kits to existing designs). I don't know much about the Altay, but it seems to be shaping up to be a respectable, if conventional, design. Nothing revolutionary about it, and it will probably be the rough equal of newer Leopard 2 models like the A6 or A7. There are rumors of an 1,800 hp engine designed in Turkey, but I've never seen anything substantial on that and I seriously doubt it. Turkey was counting on getting a 1,500 hp German MTU engine, but politically that seems uncertain now. If they had to rely on imported 1,500 hp tank engines, how could they produce an engine stronger than any tank engine ever produced? There's also talk of eventually getting it an electric engine but lots of militaries say that and no such tank engines currently exist.
As for the Armata, current hype would have one believe it is an invincible, supersonic battleship of a tank able to operate in space. This is pretty extreme - but it
is the first genuinely new, clean-slate design of a tank in service in decades, and it does seem like the way future tanks must be designed. Having an unmanned turret means they can get away with less armor there, as there is no crew inside the turret to protect. The Armata is also designed from the outset to be equipped with explosive reactive armor (ERA) and hard-kill and soft-kill Active Protection Systems (APSs), whereas other tanks simply have these added on. The new 2A82 gun is more powerful than those on other Russian tanks, while the new vertical autoloader can handle longer, more powerful APFSDS penetrators. The T14 is much bigger than other Russian tanks, but not all that much heavier, while its more powerful engine and allegedly improved transmission gives it more mobility.
I don't want to get too into it, since I'd like to fully flesh it out in a dedicated post, but the T-14 is a potentially important step forward for tank design. It isn't vastly superior to the latest Abrams - it could be a tie overall - but future tank designs will probably take more cues from the T-14 than from older designs.
3. No idea, you should ask the Civ 6 modding subforums.
4. Also a topic for a later post, but the Merkava seems overall pretty good, especially in the latest 4M version. The armor is supposed to be good, and better than most on the sides and roof, while the 4Ms come with the Trophy APS as standard. The unusual engine-first layout has led to a lot of myths about the Merkava - that it can carry infantry (it really can't), that the engine is extra armor (it really isn't), and so on. The rear hatch allows for discrete and protected disembarkation and reloading, and keeping the ammunition in the back of the hull greatly reduces the odds of taking a hit there when attacked from the front. The unique suspension of dual coiled springs apparently gives it superior off-road mobility and reduced track throwing, though I'm unclear on what its drawbacks are.
Tanks have its rol in modern war no doubt, but if the enemy owns the sky tanks are going to be the first victims after SAM sites. I doubt any armor can have much chance against a Hellfire, not to mention much more powerful missiles launched from fixed-wing aircraft like Maverick and such, or Hi-Tech cluster bombs capable of destroying all tanks in a wide area. Probably a few tanks could survive such situation long enough to face enemy land forces, but it would be anecdotic.
Sure, air power can wreck tanks. I'm just saying gunships can't
replace tanks. They're vulnerable to a wider range of arms. For example, at
Karbala in 2003, 30 Apaches were repelled with heavy damage and some losses by Iraqi Republican Guard armed with AA, machine guns, and rifles. Tanks would have taken few, if any, such losses from those weapons. Tanks can also linger in an area longer than gunships, and can dig into hull-down positions for a powerful defense. They're ultimately different tools for different ranges of tasks.