The runtime team certainly looks at discrepancies where C# and F# generate different IL that should still run about the same when JIT-compiled. So while C# is the main focus (also since the runtime libraries are written in C#), F# is not forgotten and benefits from a lot of those improvements as well.

In what concerns .NET Native, F# was definitly forgotten, given that for a long time it did not compile MSIL required by F#.

And even though it works today, it is more of an hack than anything I would thrust to sign into production with my name on it.