The producers bottom line was all about money but they do give serious roles or groom actors to be a great dramatic or great comedy actor.
The producers never had that intention with Elvis they wanted him to just use his popularity as a singer to draw box office.
I think Parker was at least upfront telling Elvis that all Hollywood cares is the money and we aren't going to change the formula until the formula runs out.
While people like Hal Wallis were leading Elvis to believe that he would eventually get a substantial dramatic role but never had any intention of giving him one.
I think it was naive of Elvis to think Hollywood wouldn't insist on him to sing in the movies.
Bing Crosby, Frank Sinatra, Ricky Nelson, Pat Boone, Dean Martin, Bobby Darin etc.
I don't know why they have to do that but it seems every singer that gets a role in a film has to sing at least a couple of songs.
I know Frank Sinatra, and Dean Martin got to do some serious roles but that was after they were older.