It barely needs a few seconds. Unless you have a massive alpha strike there's no way you can fend it off with paks
I don't said fend it off with PAKs, I said it is unlikely that it will dive in fast and kill off a PAK in one fireburst. It is more realistic you will withdraw the PAK since KV-8 will get damaged too and has to withdraw by itself. The short range always comes at risk because of snares.
Ok? I'm not sayjng it's not counterable, i'm saying that the pressure it puts warrants an Ostheer Tier 4 timing equivalent. The closest comparison in terms of role is the Bruumbar, but the Brummbar is LESS durable, has no turret and is in Tier 4. And while the bruumbar is more capable of wipe potential (especially using attack ground) the KV-8 can deny the use of multiple paks way better with a little micro.
"Smoke the zis guns" hardly cuts it when you are dealing with a 960 hp unit using as counter 170 pen turretless cannon, even if you can buy time for 2 salvos (10 seconds) which is kind of overly optimistic. Your options are very limited.
As you said there are counters and yes a KV-8/ZiS combo puts a lot of pressure on Ostheer. To be honest it better has to put pressure on Ostheer because once Ostheer reaches T4 the ZIS/KV-8 combo will quickly turn into a dead end if you didn't manage to push your opponent back far enough.
Would the Brummbar be balanced if it came before Tier 4?
No, but it is quite a bit stronger, especially versus moving infantry. A single squad of PZGrens or Panzerfusiliers can deal quite a bit of damage to KV-8 with its double shrek if you keep moving it while reloading the Shreks. Stop between KV-8 fireburst to shoot. That is pretty impossible versus Brummbar or 105mm Dozer.
Sure, I get it, I just said that it should come later in 1vs1. I could easily argue that many units are completely unviable in 1vs1 because they were balanced to be less broken in resource inflated teamgames.
I understand your point. But how should it be done without changing Soviet tech? The only thing that would make sense and change something without screwing teamgame timing would be to give it even more AI damage but nerf AT performance by quite a bit. That way you could flank/kill ZIS with a PZIV (and maybe mortar smoke support) without having to worry about KV-8.