Careful of the 'Because Race Car' argument, they're Bluddycrud products, it's a Bluddycrud championship. They
have to run them, if they didn't, people would ask questions as to why...
The fact is few people actually know what they are trying to change with these components, all they do is fit them then go, "yea that's
different, I like it". I italicised different, because different doesn't equal better. Truth be told it is often very difficult to identify an actual improvement, but very, very easy to notice a difference and simply draw an opinion on it. People do it all the time with brakes. Fit big front brakes, notice the difference in pedal feel, increased pitch angle under braking, draw the wrong conclusions that they've made an improvement.
The theory is that they change the LCA angle to horizontal to raise the roll center, offsetting the lowering of RC you get from lowering the ride height. This increases roll stiffness and 'improves turn in'.
Ask yourself this.
Why is changing the LCA angle beneficial? Is horizontal optimum?
Why is a low RC bad? What does it even do?
Why is the front RC lower than the rear as standard? You don't change the rear RC height, is changing the roll axis inclination, by raising the front RC, desirable?
Raising the RC too high induces jacking loads into the suspension. Jacking is bad. If increasing the RC increases jacking, and jacking is bad, then surely lowering it reduces it, which must be good? Why are we raising it again?
On the topic of bump steer, I've done a kinematic analysis of the Civic front suspension, while it wasn't the most accurate model, it's still a damn sight closer look at how it works vs a blind guess. The effects on bump steer were bad enough that any relative inaccuracy of pickup point locations was made kinda moot.
For zero bump steer, you need the tie rod pointing at the IC, and while lowering moved it away from that point, creating bump steer, the EBJs/RCAs moved it by a far larger amount, which creates more bump steer.
Add in the reduced longevity of these parts, both by the questionable QC of aftermarket vs OEM and the effect that lengthening has on increased loading, and I really struggle to see any real benefit.
Yes, they'll feel different, and some people like it. Even if I drove a car with them fitted and liked how they felt, I'd still not fit them to my own car, based on the above.