With all due respect, why should the JLA have to be more like the Authority, given they are different books?
Part of the problem with the comic book industry is that tendency for a unique book to be successful and then every other book has to start ripping it off to one extent or another.
Hell, DC is still strip mining large chunks of "Dark Knight Returns" over and over, to ever-diminishing returns.
It just seems to me that there should be an effort a greater diversity of styles, not following this or that trend, whether the trend is "silver age redux" or "hyper violence realism".