If I may..
Speaking from my own meditative experiences. There does seem to exist "a space", upon exiting
from samatha practice
(be it from jhana, absorption,one-pointedness,samadhi, however one wishes to describe it), which is devoid of
hindrances and without me, mine, myself-ing - wherein dhammas begin to seep back, a bit like water after the breech
of a dam. It is in this brief space (for me, at least), that it is possible to relate to stuff (annica,dukkha,anatta)in a
way that doesn't overwhelm. I think psychotherapist's call this providing a container. Perhaps this practice is to help
us to realise that we can construct(?) our own container.. or that we are a container, self-made. Something like that.