Then it's at the very least PIS for the original T-1000, cause it would have been very handy in some situations to use that abillity.
He displayed that it could lose pieces(involuntarily, by being shot at) and control them to liquify and return to his mass. while abit similiar, its not exactly the same as molding javelins from your body and throwing them.
He also showed he can shapeshift his arms (for stabbing) and flattening himself to be the floor. but if this T-1000 would have scenes where he turns into a metal version of Mr. Fantastic i would find it inconsistent as well.
the new writers just thought it would be cool.
And i suppose i rather talk bad about the current movie then the classic T2.