For comparison: my 250V 100A line's nominal load is 25 Ohms. I know by line-sag that the 60Hz AC impedance is around 1 Ohm. So another 400 Ohms in shunt will not make a lot of difference for low-frequency crap. True, at 6kHz the caps are nearer 4 Ohms and the line will be well above that (asymtotic to 100r, probably).
Also: Jimmy got a fancy new welder, wiiiii...., switching power. Without add-ons his high frequency currents would have little reason to come up my power line. With big caps here, it WILL.
Have we considered how these big caps affect a Ground Fault/ Residual Current safety breaker? As I figure, the tolerance in these caps can easily induce unbalance enough to trip a 5mA limit and maybe a 35mA limit.