Thing is, Harrop runs a business using F# and is a known troll against anything competing with F#. His MO is to focus on minutiae and make them sound like bigger deals than they actually are. Then when asked about a limitation of F# typically responds "well you'll never need that in the real world anyway". (See his responses to e.g. http://stackoverflow.com/questions/21170493/when-are-higher-..., trolling every single answer, including my own).

So, while potentially everything in the article is true, it's all likely overinflated and/or has workarounds. I'd not put much weight on anything in here.