[Peaker]

You're overstating it. Debugging Haskell code is definitely harder than in other languages.

But it's far from impossible (I use Debug.Trace successfully), and you do it far less often.

So debugging takes 5 times more effort but needs to be done 15 times less than in other languages.

At least that's the deal I'm getting and I don't usually find myself debugging much so it's not a grave concern.

I'd say lack of non nullability or pattern matching are worse show stoppers.