I'm not sure if this really applies to philosophers in general or just a few that have been commenting here, but I think I've found one source of friction. It seems that SI/Luke care about problems/questions that are different enough from what philosophers think their field is about for even good(by its own standards) philosophy to be largely worthless for SI's purposes, while still being similar enough on the surface for a lot of destructive interference to happen. By destructive interference I mean things like LWers thinking that phil should have relevant answers because it addresses similar sounding questions, third parties thinking that SI type work belongs in phil journals/departments/grant slots even when its not really appropriate to that venue, having irrelevant phil papers pop up due to overloaded keywords ect.