https://bugs.winehq.org/show_bug.cgi?id=50281
--- Comment #11 from Shmerl shtetldik@gmail.com --- (In reply to Zebediah Figura from comment #10)
fsync is unlikely to be accepted into wine-staging because it represents a significant additional maintenance burden for practically no benefit. In particular the number of applications that it is known to help can be counted on one hand. Furthermore esync is already a very significant maintenance burden; it has been easily the worst patch set in wine-staging since its induction.
Thanks for the explanation. At least that's good to know that there aren't many applications that actually benefit from it.