Since there seems to be no further discussion regarding this, I formally submit my changes to the !TEXMAP spec and the Official Library Spec:
!TEXMAP spec (changes highlighted in red):
https://www.ldraw.org/draft-texmap.html
Official Library spec:
Under META Commands add:
!TEXMAP Meta
Sufficient !TEXMAP <geometry2> and/or <geometry3> lines (as outlined in the Texture Mapping (!TEXMAP) Language Extension) must be included such that the part renders correctly in non-!TEXMAP supporting programs. It is highly encouraged that the included geometry reflect the pattern created by the !TEXMAP, even if it is reduced in resolution or colors, but this is not required.
!TEXMAP spec (changes highlighted in red):
https://www.ldraw.org/draft-texmap.html
Official Library spec:
Under META Commands add:
!TEXMAP Meta
Sufficient !TEXMAP <geometry2> and/or <geometry3> lines (as outlined in the Texture Mapping (!TEXMAP) Language Extension) must be included such that the part renders correctly in non-!TEXMAP supporting programs. It is highly encouraged that the included geometry reflect the pattern created by the !TEXMAP, even if it is reduced in resolution or colors, but this is not required.