Actually that's changing - PowerShell Core works anywhere .NET Core does (including OSX and Linux).

https://github.com/PowerShell/PowerShell#-powershell

(although that doesn't account for personal preference, of course)

That does help, and is welcome. But convincing a team to switch something as fundamental as their shell is an uphill battle. I'm sure PowerShell is great (I've never used it), but shells always struck me as the kind of thing where "good enough is good enough".

I think they're still working on that:

https://github.com/dotnet/roslyn/blob/features/records/docs/...

Nice. I hope it's interoperable with F#

Perhaps it's because they're item numbers, not indexes? As far as I can tell, C# uses 0-based indexing because most similar languages use 0-based indexing.

Up-for-grabs lets you filter by language:

http://up-for-grabs.net/#/tags/C%23