> The way I figured it, is that the initial designers of R/C receivers
> made the 20 millesecs delay so that they can fit 10 by 2 millisec pulses
> for 10 servos in one radio train of Rx pulses

They use the wider delay to sync the receiver, so that it knows which pulse
goes to which servo. Otherwise, it would be impossible to sort out.  It was
a cool answer to the problem in 1960's technology.  Error correcting digital
would be cool now, but it dosen't seem to be happening.