>>67142
It's not even that the lore is small. Many character profiles contain a lot of information. Youmu, even before being a playable character, got that whole backstory with Youki disappearing despite having nothing to do with the actual story.
ZUN's lore is filled with mysteries, but he refuses to expand upon it.
Until PoFV ZUN was still invested in developing his characters. Imperishable Night had 8 playable characters and, although not fully implemented, four of them (Reimu, Marisa, Sakuya, Youmu) were meant to be Stage 4 bosses. IaMP followed featuring many characters from the first two games of the Windows era.
And finally we got PoFV with its incredible roster of characters.
But beginning with MoF things changed with ZUN focusing almost exclusively on introducing new characters.
That may have kept the series interesting for a while, but in recent years the relative popularity of newly introduced characters has been in steady decline.
He also got much lazier: MoF only had two playable characters and was the first game to have those uncolored sketches as ending screens.
The first part of the MoF interview in the latest volume of Strange Creators of Outer World is also relevant, especially the "anti-series" part:
https://en.touhouwiki.net/wiki/Strange_Creators_of_Outer_World/Introduction_of_Previous_Works/Mountain_of_Faith/Mountain_of_Faith_Interview_with_ZUN
Basically, ZUN thinks that giving fans what they want would be counterproductive to the sustainability of the fandom. With mysteries unraveled the content itself ceases to be interesting. While there certainly is some truth to his argument, I personally think that's just a sign of bad writing.
I think the EoSD 2 he mentions would be a great idea. It could be used to give us more background information about the SDM team and maybe even add another character to it.
I don't see how it could possible be detrimental in the long run.
Essentially, he isn't even just ignoring fans but intentionally opposing them.
We used to have a lot of lore discussions in Touhou communities, but in recent years it feels like most of the remaining fanbase has grown tired of his shit.