Because given enough opinions, everything can become controversial.

Haskell is, as any other programming language, a tool. It has pros and cons like any other tool. It is applicable in some situation and not in others, like any other tool.
If all person A has is a hammer, then everything will look like a nail to them. If all person B has is a screwdriver, then everything will look like a screw. These two people will argue amongst themselves to the extent that person C will consider the hammer and the screwdriver as controversial.
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