Man, I like this guy. He really couldn't help it. He is driven by the muse.
A lot of people stand by the wayside, but some folks go right up and dig in. He certainly did, by the sound of it. I am interested in his compositions after he did these impassioned things.
....not that I'm recommending that others do it....
After 1888 he continued to revise a lot of his earlier works. Here's a list of what he completed (for the first time) during and after that year: Symphony # 9 as far as he got it (3 movements: he suggested near the end of his life his 1884 Te Deum could be used as a finale for his 9th: I may try that tonight), Tantum ergo (5 settings: he'd composed a number of settings of this earlier), Traumen und Wachen, Das deutsche Lied, Psalm 150, Vexilla regis, Helgoland, and Tafellied.