You maybe should read the thread (and others) a little better, a lot of people are raging for endgame content.
Endgame is simply content that's designed to work with the top level range of a MMORPG at any given time. The fact that level ranges could be increased in a non-foreseeable future has absolutely no bearing to that. Level caps are common in all MMOs, but developers still work on the *current* endgame, since players don't play in the future. By your logic developers should *never* work on the endgame in any MMORPG that supports the possibility of a future level cap increase.
The current endgame is level 50. We don't know when that cap will be raised, but it's unlikely that it'll be anytime soon. For pretty damn sure it won't change anywhere before the new battle system is introduced.
The current roaming NMs are, by definition, endgame content (albeit small, but this doesn't change the fact).
Lowbie content is by definition less complex, simply because the level of challenge is, in all MMORPGs, designed to increase towards the highest levels (and because players themselves have less tools to use). Less compexity means higher adaptability to newer systems. It's pretty simple.