
In interviews long prior to publication, SRD was twice very explicit about the importance of understanding his psycho-philosophical stance in order to unravel the coming culmination, so I'm with you up to there, u.
However, I don't see the Last Chrons as some sort of self-help catharsis on his part. I'm more on the lines of SRD becoming a more blatant allegorist to expound his personal Weltanschauung - no harm there, except I think he does so at the direct expense of reader satisfaction in the narrative line that clothes his message.
This is honestly why I think he isn't worried about apparently carelessly tying off multiple narrative threads all at once (Longwrath, anyone? The skurj and the Sandgorgons all getting wiped out in the space of a page, anyone?) , or using clunking dei ex machinae such as SWMNBN and TC's sudden teleportation capacity, or rushing the ending ("To infinity and beyond!" as the dynamic trio hurtle upwards, "rising like glory". Curtain. And hey presto! Suddenly we're in cutesey CareBear Land and everyone's fine

Either that or, as someone claimed elsewhere, an over-zealous editor chopped out 100 pages or so. If that's true, may that editor be given multiple tabasco and iron filing enemas.