Aaaaannnndddd just when the discourse seemed like we were headed in a decent path last night, here we are...
I don't think that's their point. The point as I'm reading it is that any archetype (good, evil, whatever), we have people saying "Well, if you want to play that, just use the stat block or whatever. But my favorite archetype needs a full class." I.e, why are people demanding a warlord when there are existing warlord options but if someone wants to play archetype X (doesn't matter what it is) that also is just briefly covered, why are you telling them they don't need a full class and to play with the options?
Which brings me to a simple metric: popularity and demand. How many people want to play a warlord vs how many want to play an evil stepmother? Both cases rely on the same argument, but it's a matter of demand. If the demand warrants the time and effort, then make it so. IMO anyway.
*also, for clarity, my first statement above your quote wasn't directed at you