I agree - but I would say closer to 2 to 3amps. Above 3amps, the resistance of the pins on the connector cause a voltage drop through the connector - less voltage delivered to the RX.
you must be aware though that servo type connectors are only good for carrying between 1 - 2 amps.
Most of the high current regulators have two "heavy duty" servo connectors - and you need two open channels on the RX to plug them in.
You can cobble together a "Y" cable to share the servo connection & the regulator - just make sure the "Y" cable uses heavy duty wire. With this setup, you are good for about 6amps current draw with no voltage loss through the connections.
I just received the Perfect Regulators Spekline in today's mail. It looks simple and it comes with the Dean's plugs pre-wired. There is a switch for 6.0v or 6.5v output. It says it is rated at 10amp continuous and 16amp spikes.
Using a 2s LiPo (8.4v) and the switch set to "6.5", I measure 6.65v open-circuit & 6.52v with the RX switched on.
My main concern is to replace the POS (Piece Of Sh1t) Castle Creations BEC Pro 20 - which is a POS. I just hope the Perfect Regulators Spekline doesn't break a wire or burn out (like the POS CC BEC Pro 20 POS).
BTW: Did I happen to mention that the Castle Creations BEC Pro 20 is a Piece of Sh1t? Because, it is.