1. Possible to max 5 stats v.s. 4 stats on your gear, assuming that it is HQed.
2. Assuming you do the above, you have gear that may be better than darklight. <----- this is highly debated / contested
3. Skip the farming process for tomes to get your darklight gear.
the 1 & 2nd reasons may be important if you're really worried about maxing the potential of your role (dps, tank, healer). However, if you boil the debates around ilvl70 gear, the 3rd reason is why you're going to buy it.
TL;DR ilvl 70 items is either for collectors or those wanting to skip farming darklight gear.
I hope this clarifies what the purpose of ilvl70 items are, but if I have written something wrong here, PLEASE correct me!
-R.Y.
shoutout to CaD, Choco, & Awsumz...<3 you guys