The only downside to polishing that swing arm is it makes the welds look like crap
TIG welding aluminum is very difficult to make look perfect, but when polished, it shows any imperfections in the beads. I guess with the wheel and shocks on, the beads holding the shock boss will be subdued, but they sure stand out screaming in these pictures.
I wonder, or do you know, did they heat treat your swing arm after fabrication? I'm only curious as to whether they do or don't, whether they deem it necessary? I suspect its not needed since they didn't cold bend and form it then weld it... It looks to be a really well-made piece of kit