One point to note is that the script handling has had some issues on Windows based servers (includes SAS Invasion), issues that tend to start happening in the last regular map or in the first final battle map.
The issue in the final battle map can lead to areas not becoming captured by neutral when destroying the towers which can make the map play out in an unintended way, making it very hard to advance as the enemy continues to control such a large area and also continue to have larger capacity thanks to controlling that area. This makes it hard to make adjustments in the map as the opinions about difficulty might not be entirely reliable.
There's another bug related to neutral faction and them owning areas which have military targets, which causes neutral to have some soldier capacity, which in turn ends up spawning Brownpants look-alikes charging around without weapons. That one's hilarious and I can't say how large groups they spawn in Invasion, in single player they wouldn't be more than a few soldiers anyway.
Anyhow, still without much experience of playing the map in Invasion myself, my gut feeling is that the AI compensation value (x8 per player) is too much in general for this particular map which is intended to have the enemy
mostly not respawn soldiers after the beginning. AI compensation directly affects soldier capacity increasing spawners. The next version is going in with x5 compensation and efforts have been made to fix the bugs, we'll see how it goes then.
The intention of having the enemy not respawn, and instead only boost their numbers in the beginning, is that the map would eventually end no matter what - at some point you'd run out of enemies to kill, and I think that's needed in such a map where you don't have the bots yourself. It just doesn't happen right now in online because of the high compensation figure.
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à propos cover, it was intended to not have much cover in general. If you go stealth you usually don't need to stay behind the same cover for too long.
I think the point is that you'd be able to sneak closer to the enemies instead of having to stay as far as you do as there would be more hiding spots. Crawling around to a stabbing distance would allow some great feels. Some decoration vehicles on the streets, flat roofs with some obstacles on roofs, more corners to buildings, just a little bit more of that stuff.