At some point I should write a sad, bland blogpost on how the splatbooks were harbingers of Low-Trust Trad swamping High-Trust Trad out of commercial existence.
Not because splats are intrinsically LTT design: they're not! They _can_ be very valuable to roleplayers, and their designers are sometimes passionate about that very thing.
But because of how publishers viewed them from the _business_ side.