The decanonization of "Let There Be Light" may have been due to a combination of reasons. Is there anything in the RAH correspondence about this?

As for the progression of pulchritudinous stars, it seems rather like chasing a will-o-the-wisp currency, dumbing down to a short time horizon. One would as soon expect, for instance, a titular reference to Philosopher's Stone to be warped and simplified into Sorceror's Stone. Oh, wait --

Perhaps they were -- and as I've noted elsewhere here, perhaps I'm not the best critic of the written work -- but I liked those, as well.

Sure there are holes in them. But there are holes in Tom Clancy as well, and he managed to be pretty popular.