when the battery is unplugged there is no question whether the receiver is unpowered. batteries drain plugged in or un plugged, we all know that. switches can be forgotten about just as easily as plug connections. the guy that I knew the best, that never used a switch, was a TV repairman that had his own business and built all his own radio equipment and built my first radio,...do you think a switch in the circuit was too complicated for him, or was he just lazy, too ?.
I can't imagine someone smart enough to be involved with R/C , but too stupid to comprehend a simple inline switch.
as for simple,..... the simplest system does not include a switch,......above you said a switch might over-complicate a system,....remember?