just skipped around through some of the CPU-limited sections since I imagine that's the only part that matters.

Yeah, pretty much, I included both for the sake of it.

In any case, it seems like there's not much to gain from using NTSYNC yet; maybe improvements will be made to at least tie FSYNC. My rudimentary (possibly incorrect) understanding is that FSYNC is hacky and that NTSYNC is the "correct" way to do it, so if nothing else getting NTSYNC to tie FSYNC means FSYNC can be deprecated at least.

It might be better in the future, but it's not there yet, the implementation is not even finished to be fair.