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For some, that stuff like <:> >>= <=< @>-,-'--() in every line can be annoying
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Some people are going mad when they see all the possible ways to write out the same thing
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Tooling is limited, awkward and slow
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Library quality and coverage is inconsistent, you can't easily do UI development and machine learning with Haskell, lack of libraries
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If you don't have a beefy PC, don't even try to compile Haskell code, you're gonna probably be faster a fossil fuel than your crappy PC will compile your code, just loading modules into GHC can take almost half a minute