Not to add fuel to the flames, but seriously, let's do some calculation in a modern RC system (Circa 2008/2009 not 1985).

Suppose you are running a low-end LiPo that have capability of 15C continuous, where C is a conservative 3000mAH

P = V * I = I^2 * R = (3*15)^2 * 0.00012 = 0.243W

So in this really conservative system, the connection point, which is insulated, is trying to dissipate nearly a quarter watt.

Let's take an extreme example, let's say you have a fairly decent pack, something rated at 20C continuous, where C is 5000mAH this time.

P = 1.2W

Remember that you are trying to dissipate 1.2W in a tiny little area with insulation. The connector will eventually get warm.

Well, suppose the Tamiya connectors was a magnitude worse (in which most cases is true compared to the high end stuff like Traxxas and Deans). 0.0012 Ohms instead of 0.00012.

You just bumped up the 1.2W Traxxas connection by a factor of 10 and you get 12.0W. That's quite a bit of power! Your connector will definitely burn up.

While I agree with you Trix that 0.00012 seems small, in modern RC systems, there is an INSANE amount of current being pulled, especially when these hot LiPos are being mated with a hot Brushless system.

Also, all wires are fuses, it can only carry so much power across it before it breaks down and pops... You want to be as far away from that condition as possible, far away on the other side of the extreme.

This is just a case-study of the connector with a PERFECT connection (first time connect). From then on, the performance will degrade due to oxidation and degraded mating due to mechanical stress of mating and unmating after a zillion times. You would want something that's as far over to the curve as possible, even if it sounds extreme because that 0.00012 rating is when it's brand new and connected once on some test bench somewhere...

Also, soldering is NOT "zero resistance." The resistance of solder is measurable...