They should correct me if I'm wrong, but I believe the GP's point was that there should be a standardized way for software to present spatial audio to the sound

They should correct me if I'm wrong, but I believe the GP's point was that there should be a standardized way for software to present spatial audio to the sound system, which can then render it according to the user's preferences. How the sound is generated (e.g. moving point sources; spatial reverb; pre-spatialized tracks) does not matter. Yes, using even third-order Ambisonics is not as precise as rendering all point sources (and non-point sources...) exactly through the HRTF. But it is an existing standard you can use today via OpenAL Soft.