I think that's not entirely fair. While MS could definitely invest more resources in F#, I wouldn't say it's been neglected (or dying). Just to mention a few developments in recent years:
1) IDE support via Ionide in VS Code
2) Easy install with NuGet
3) cross-platform FSI supported via NET Core
4) some pretty cool updates recently around anonymous records, optional yields, nameof (just to mention a few)
5) no breaking changes (I'm aware of, anyway)
I'd say the future looks pretty bright for F#. It's really resonating with an audience that wants "functional where I want, but practical where I need".
I'd say the future looks pretty bright for F#. It's really resonating with an audience that wants "functional where I want, but practical where I need".