I have a hunch.. maybe, just maybe Dan Simmons had a role in his odd departure to philosophy/extreme sci fi. The latter books came out during the time of when Simmon's Hyperion became popular and won the sci-fi awards. Simmon's novels lack character depth, and not much of a story line.
it does, however, introduce/reinforce radical concepts such as the datasphere (suped up internet basically), radical AI's, farcasters, mysterious time waves, philosophy atune to Ghost in the Shell, etc etc... You can see influences in today's sci fi from Hyperion.
Maybe the sci-fi circles of that time revolved around generating new sci-fi concepts that has deep roots in philosophy and what not. I'm assuming that is why Card wanted to create a novel that involved character depth across all species (human/alien) and races (latinos, asian, european in the Ender's series) and meld it with Hyperion-isk concepts (auia, philotes, philotic web, and that whole virus species thing derived from some sort of force that gives intelligence to select living beings, which in essence, connects all intelligent species together across the universe...etc etc.. and that's where the ansibles are from... etc etc)
well, I thought it was interesting, but ya, it's a bit off of his usual writing style (light on sci-fi/fantasy utility, but based in a sci-fi/fantasy setting, and heavy/deep emphasis on character development)