Just want to let You all that I'm an author of most stuff ( but of course we have also some cool contributors!) so if You have any questions feel free to ask them here.
But i still like it and managed to create fancy stuff with it - Ionide, React.js + Material UI applications etc. Wouldn't recommend using it on production ( unless You want to commit really hard into FunScript project and probably fix lot of this stuff) - WebSharper is providing more complete, richer solution and commercial support if needed
Intellifactory's Websharper projects are well supported and regularly updated, you could try Websharper.Warp[2] in lieu of FunScript.