Hi Kevin,
“Syntactical indifference”... Thanks for mentioning it,
and leading me to this awesome resource online!
Looks like an interesting read:
http://lbms03.cityu.edu.hk/studproj/ee/2007eepsb281.pdf
In my opinion, the newer methods, have yet to match the
“appearing human” characteristics of the older methods.
( Not to criticize the good research being done on newer methods. )
So, it may be a question of studying why the older methods
simulate humans so well, in order to extrapolate a newer method.