Not sure why my first post got rated down tbh, I just meant that in XI there were a lot of use in being able to solo mobs that were tough. In ARR I am not so sure there will actually be any mobs like that to kill, and if there are if there is much point in killing them solo.
I mean there will be no NMs, the few BCNM-like events we have heard of (primals) at least in 1.0 didn't have anything not rare/ex, instances up to cap is basically for exping meaning soloing it will most likely not be a very efficient way of doing it, raids will most likely have mostly rare/ex items.
Adding to that there is now a tiered progression system which makes older gear useless. One of the reasons there was a point in actually killing older mobs (which a lot of the NMs that were soloable were when they were first soloed like sky/sea/enm) was that they might have had a specific item which was old but still good for that particular slot/ability. Without gear swaps and new content more or less making all older content useless as soon as you clear the new content kind of takes away the reasons (outside of just pure fun) in even doing older events.
I guess with the tiered progression system we have it might be a point in soloing lower raids if you have progressed past them to be able to sell the items on AH for those who haven't progressed that far yet, assuming it isn't rare/ex and instead "bind on having gained exp with the item on".
Hopefully I am wrong though because soloing really tough mobs is amongst the most fun I've had.