cutting the Time VXRS seatpost?

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so i'm checking out one of those time carbon bikes w/ the integrated
seatmast.

the included seatpin is about 12"/30cm long and says in big letters:
DO NOT CUT.

that seems surprising to me...if the benefit of an integrated design
is supposedly lighter weight, then why cant you cut the length of the
inner seat-pin to minimize the total weight? i'd think all you would
need is 3-4cm of seatpin inserted inside of the mast...but this DO NOT
CUT limitation means you've got about a foot of seatpin material
inside of the extended seatmast.

anyone have any info on what the deal is w/ cutting the seatpin w/
time's integrated seatmast designs?