I am not a big fan of how GW has implemented special characters. I would prefer that the special abilities, wargear, and stat bonuses be incorporated into the standard HQ choices of a codex. They could still highlight special characters with specific builds, but they should be built using the standard HQ choices.
However, given that GW has chosen the path they have, I do not care how my fellow player uses special characters, or counts-as versions of them. People should feel free to make armies however they want, using all the options in their codex. Meta-game taboos on using certain options in a codex, or whole categories of them, seems counterproductive to me.