I've always thought a reasonable quality of secondary wood, for drawer
sides, back & bottoms, is not going to warp or check because of
exposure over a long period of time. If the wood is of poor grade,
then the individual pieces, that small (dimensions), may develope
problems for drawer function.
I've always thought the simplest, easiest, least expensive,
essentially universal, time tested, best fix for lubricating wood-on-
wood is wax. To me, to ponder the issue, for another fix, is an
exercise in an attempt at overkill, which probably won't work as
efficiently as wax, anyway. What I have considered is 'what is the
best wax to use'.
I don't recommend using a melted, scented candle wax that has re-
solidified. For some reason, it seems to be different than the
original chemistry and results in a chalk type application, rather
than a smooth, waxy application. Maybe it's the scent ingredient that
makes for this chalk effect.
Additional to the lubrication issue: I don't use paint or poly on the
insides of drawers, but I do spray lacquer.... quick, easy, cures fast
and basically its only function is to give the inside a "finished",
esthetically pleasing surface, rather than remaining raw wood.