I wish this project well. I hope it improves compatibility with BSDs for more projects.
Even at the time, few games used an API where they managed multiple channels directly; Software mixing was commonplace from the 90s. Any game that wanted to play battle sounds was not relying on the mere 6-8 channels that cards from that time could handle.
Our modern Pipewire based workflow is remarkably simple and remarkably effective, and it's significantly an evolution of PA.
And I don't recall a lot of software working well when Pulse isn't available, so I don't know why people still bring it up. Perhaps it's because I wasn't there at the time, but I've only seen ALSA as "that audio system you use when you have nothing else available". I still need the PulseAudio-wrapper for Pipewire to be useful for my systems, so clearly the Linux world has moved to Pulse-first.