Okay since 4.3 Ive noticed that infantry on infantry fighting has become REAL hard with allot of casualties which I found was a good thing until i notice how I never saw the AI but the AI kept killing me. So I ran some tests and I would say that the AI spotting ability vs other infantry is a little bit over the top so to say.
Let me introduce my case:
Enemy infantry squad are located 600m out with observation away from the blue spotter, so they have their back against the single spotter inside the forest tiles. between them are open area, no obstacles for observation.
While the spotter are laying still the enemy is not observing him. But just by crawling - which is supposed to be the most sneakeast way to do it, they spot him 600m behind them and turn around and engage him. If you try to crawl or walk they spot him even quicker.
Next test location is with both sides being in a forest. Red still with their back towards the blue spotter and the spotter gets around 330m behind them crawling before being engaged.
I have tried this with sniper in guille suit as well and the only difference was for the blue sniper in the forest-forest location, he got around 100m from the enemy before being discovered and engaged.
I have tried different quality settings, but even elite on blue and untrained on red seems to have no effect of the spotting skills of the AI infantry.
My case here is that with a infantry squad observing 12 o clock its hard to see a crawling person 600m away over an open field inside a forest edge, or see a crawling person inside a forest crawling 300m away. Normaly you only have like 1 guy covering the squads six o clock and the results I am seeing here is almost like the entire squad is observing six o clock with binos.
How to replicate:
Launch the scenario, order the spotter or sniper to crawl forward inside the forest and see how the AI infantry turns around and shoot them up.