Profile of Katitof

In tournaments? If its the case, then its most likely due to top players during tournaments rarely pick soviets, most of the time they pick UKF\USF.

I didnt see relic post win-rates for automatch anyway. Not like, I'm saying soviets arent weakest allied faction, not over-all weakest, but I would like to see win rates.

On ladder.
Not by much, but its lowest.
One of the balance modders posted some ratios some time ago.

Where do you guys get all the unit stats and all the data on how units are able to perform or when they are not performing correctly?

We don't have any "data", balance modders might have some limited access to certain metrics, but other then that, we basically use "eyes", if one unit or doctrine is dominating meta completely, its likely its overperforming.

Same when something is never being used.

I have to confess, after playing coh 2 for so much years, I really don't know anything about the in-depth game stats.
Like all these "received-accuracy, scatter, target size, burst duration, single target..." I can just guess what they mean, but I have no idea what they are or how they work in the game.

They aren't all that hard to understand them, its just, there is shitload of them to learn first.

How does pop-cap affect the game besides limiting the army size?

Affects "spammability" of certain units or upkeep you pay for them.
If a unit has good stats, but is spammed, you increase its pop cap, so it becomes more expensive to have on field and you can not get other unit you otherwise could as now you need to consider if you want 2x X unit or 1x X and 1x Y instead due to pop cap restrictions.
That ofc is just an example, but in-game example of that would be Churchill Mk VII.

The other day somebody pointed out in a stream that the SU76 has bug that affects the way it acquires target, or also I never knew that each infantry squad has a different model formation assigned to it.

Yeah, these things are being found out mostly by modders who dig the files and can catch correlations or lack of it between similar archetype units.

Hell I didn't even know that vet 1 in most infantry unit just adds an ability without changing stats, I always used to believe a vet 1 unit is supposed to perform better.
Where do you guys get all this data from? As much I look for it, I don't see any clear explanation on how this stuff works.

There is no one definitive source.

Some info comes from guides, some from pages like https://coh2.serealia.ca/#51 and some from aforementioned modders digging something out.

Command Panther, Command Tiger Command Panzer and Command UKF vehicle do not.

Many =! All.
Reading comprehension 101.

Actually you are the one that forgot to mention the long list of micro light vehicles that do gain shared veterancy like:
M3
WC51
...

M5
M3
...

I have pointed out that there are more units with shared vet.
Never have I said these were the only missing ones.
Simply pointed out your nitpicking.

Glad you have seen the error of your ways and supplemented that quite vital information.

snip

You missed the point like B4 misses its targets at long range.

too long ..compared with other rocket launcher where schrecks or puma needs 1/4sec

Other rocket arty also aren't doctrinal, arrive much sooner and cost almost 50% less.