This question has been on my mind for quite some time and I have always focused on the benefit of it through keeping new and returning players caught up on the current content, but does it also reduce the desire to raid and strive to complete raids for the wondrous shiny things at the end?
Since the redesign SE frequently updates it about every six or so months to make the face-roll dungeons give the new tomes to exchange for current raid quality gear. This also makes the dungeons become trivial quite fast. I believe in your normal MMO with a large group based endgame (raids) you usually have difficulty tiers of content such as Dungeons > HM Dungeons > Starter Raids > Intermediate Raids > Final Raid. This type of system is also accompanied by the gear treadmill where you must obtain most of the gear within your current content to progress to the next tier of dungeon or raid. To compare this system to FF14 it would look like this:
Dungeons > HM Dungeons > Primals > Raids.
With SE's system the difficulty and gear gaps between the 4 and 8 man content seems to be extremely chaotic with it changing many times over a few patches. This becomes a problem when you have very easy dungeons that give better gear than the Extreme Primals which is currently the case. It essentially looks like this for gear:
Dungeons (i160) > Primal Bismarck (i175) > Dungeons (i180) > Primal Ravana & Alex NM (i190) > Same Dungeons(i200) > Alex Savage (i210)
While all content gives tomes to some degree the dungeons offer the most for your time and is the preferred method of choice to obtain them in a timely manor, but the fact they give them at all for high end raid quality gear is giving most players tools for work they are not ready for. In terms of difficulty it looks like this:
Dungeons (i160/i180/i200) > Alex NM (i190) > Primals (i175 & i190) > Alex Savage (i210).
As you can see there is a major gear distribution problem among the different difficulties of endgame content. The most notable one being dungeons giving i200 over the next two tiers of difficulty. I believe this may be affecting the community in a negative way when it comes to players interacting with each other on both sides of the difficulty spectrum having the appropriate gear to clear the hardest raids.
I cleaned it up and thank you for telling me.