
Youngest adventitious roots are at bottom middle in pic below:
(As important for tree stability as nutrient uptake)

At repotting where should soil line be...an inch or so below fiber? in below pic:
.

An excerpt about how roots branch from root "pruning"/transplanting:
species typically produced most of their roots within 30 cm of the trunk, and cut roots of many species were frequently observed to branch and regrow. Species varied greatly.... Entire report here:
http://www.ces.ncsu.edu/fletcher/progra ... r/palm.htm
An Encyclopedia of Cultivated Palms (Riffle + Craft) says leaf bases and fibres can be removed, leaving (in a Trachy) "an elegantly slender, distinctly and closely ringed stem." I might do that after repotting. Birds often tear away fibres for nesting material.
Barb