Not forgotten, just someone starts working on something, then they get to the home stretch and we talk about it (like we’re doing with this hopefully upcoming PCSX2 core update), but then they hit a fatal snag and can’t finish it out. It happens sometimes
People always tell us they want more progress reports, blog posts about what we’re working on, etc. but then if something WIP doesn’t pan out, they hold it against us indefinitely (e.g., Supermodel and Daphne, which people still complain about, even though they were announced years ago and barely even made it out of the gate before the guy working on them got stuck). It’s lose/lose.
With dolphin-libretro, specifically, it’s very hard to motivate someone to update it–which is a very big job–when any mention of the core is immediately met with a chorus of “just use standalone,” “nobody should use dolphin in RetroArch when standalone is literally perfect,” “RetroArch sucks for 6th gen and up,” and so forth. This sort of thing has been a big problem for the existing LRPS2 core, as well.
For PPSSPP, people hassled us for years about it being behind and then when we worked to get the libretro-ization upstreamed, they immediately started griping about how they wanted the old core back, and we still get the “RetroArch is behind [-ed: we’re not], just use standalone” refrain.