yea I've seen this problem as well, seems they have added collision boxes to certain bushes that previously did not exist
Yea that's a good solution, I have no knowledge of the technical side of AI targeting but a limit of 5:1 or 3:1 per unit type would make it a lot better.
That's a good point, I haven't done any in-depth testing it's just something I notice when I have a thicc line of spear-equipped infantry. They let most of the cav go right through without hitting them. Now that you mention it, they do stop the first horse most of the time.