I use Haskell because purity and strong typing gives so much control over what each part of the program does. This has huge benefits when it comes to security, and just general lack of bugs. Also, it makes the code easy to write, once the types are in place.

I use Haskell because I find laziness to be a super power. I can solve so many problems in the most straightforward way, and then laziness saves my butt w.r.t. performance.

I use Haskell because it is a better C than C is. The foreign function interface is brilliant, and I can take C primitives and apply all the abstraction mechanisms from Haskell to them. My latest project has been OpenGL based, so lots of caring about byte alignments and shovelling data to the GPU. But all this can be automated with clever use of type classes and Generics (Haskells super cool meta system of data types.)

I use Haskell because I love applying abstractions to make code which describes the problem, and then the compiler finds the solution.

I don’t do programming for embedded, so I am rarely memory constrained. I also understand Haskell memory usage quite well, and can get myself out of trouble.