IMO, you did not answer your own question in the first paragraph. Pulling in the top of the wheel is not the same as pushing out the bottom even if you land on the same camber number. Just like in balancing a cars grip. You can either take away grip from the end that is sticking, or you can add grip to the end that is sliding. The result is the same with a car that has balanced grip but in one case you have a car with less overall grip but balanced, and in another case a car that is balanced but with more overall grip.
So IMO, it is important how you go about achieving something. How you achieve something can have an impact outside of the specific thing you are trying to achieve. Knock on effects. IMO things like setup geometry are dynamic and there are sacrifices based on how we do things.
But just so you know, no one agrees with me on this point either. So if it is important for you to be accepted by others in how you do things, go with the bushings. They will also tell you that the ball joints fail at a higher rate (even though I have had the same set on a car for 4 years). I will also concede that the knock on effect i am worried about in using the bushings over the EBJs is probably very small. However I listened to the same people advising you now very early in my SM life and what they told me was that champions worry about very small things. And that by adding up very small things they aggregate them into a championship winning car.
Now if I was a betting man and I listened to people here and they all said it doesn't matter which way you do it; and there was one raven lunatic that said it did matter; then I would go with the lunatic because he just might be right. And per others you can't be wrong going with the lunatic because it doesn't matter, right??