I mean, for me, there's only so many times I can do the same content over before I need a break. I used to be a regular at all that stuff. I participated in the first 11-in-an-hour Hami run. I did 3-4 MSRs per day for months. Run through every iTrial dozens of times.
I still have metric tons of incarnate stuff on a couple alts.
I mean, Blaze and Theodorre and the other leaders are awesome, and I had a lot of fun doing that stuff. But after killing my 10 millionth Rikti, it kind of loses its luster. I moved to Everlasting and now I spend most of the time RPing. I still do the odd raid or Trial when I feel like smashing stuff, but nowhere near like I used to.