I think the post assumes that everyone who "dips" models does not bother to add detail.
I have several armies;
Tau - not dipped, but washed, weathered, etc.
Necrons - not dipped, special layering of metalics and shaded clear coats
Marines - not dipped, washed, weathered.
Nids - detailed, AND DIPPED!!
The dipping on the nids does a few things.
Is a great wash effect.
Actually transforms their base color into something amazing....
protects them
Makes the look "shiny' and "gooey". They LOOK like aliens that just hatched out of something vile.
I paint teeth, hooves, tongues, etc. then they are VERY CAREFULLY dipped....there is an art to doing it well.
Lastly, they are custom based.
I spent a LONG time working on their color scheme...trying about a dozen or so variations to achieve my final result. The dip I use combined with the very specific under colors produces an exceptionally rich color mixture when done.
For example, here is one of my models prior to the dip and final details.
He has about five different colors on him, and many details have been picked out.
here is is post dip and basing (forgive the blurry pics, it was late...).
My goal was to create a "chitin" like color on the shells similar to that of roaches.
(if you want bit of detail on the mal, check out my post on him
Here
Now, it is also true, that you don't have to do much detail to still get a good look with dipping...nothing is wrong with this.
Its just another tool to get the job done.