Voice of truth!!
Do you know what would really make the gamers understand that they are supposed to use modules?
Making no healing be the starting point.
Just that, zero healing, nothing... which clearly means that you have to pick at least one of the additional options presented otherwise the game won't work.
This would also mean, that in any public convention or FLGS event, they always have to pick at least one of the healing mini-modules, but there is no "default" or "home base" to fall back to.