The ANSI essential requirements require no more than 1/3 from any interest group. (Iirc, that's for safety related standards; I believe there are ANSI standards not relating to safety.) That's why all NFPA documents, including the NEC, are ANSI standards, and only a few ICC documents, 300 and A117.1 at least.
The ANSI process assures a balance of interests, with no one interest dominating.