Bent upper control arm!!!!

They allow for more caster. No real geometry change in regards to things like roll center, bump steer, camber gain, etc.....

You can install moog 7103 upper control arm bushing in factory upper control arms are gain 2-3 degrees positive caster adjustment.

Improving available caster, to me is a geometry improvement. Your right, the rest is unchanged by the new arms. However going to a heim also prevent deflection.

The tubular arm itself is a stronger, nicer looking piece. at least the RMS one is. I can't speak for the others.