Oh, it definitely pops up a fair bit, but it really is just not-well-factored code. It's a direct parallel to having long boolean expressions, or long equations

Oh, it definitely pops up a fair bit, but it really is just not-well-factored code. It's a direct parallel to having long boolean expressions, or long equations without breaking out any sub-expressions and storing them in named variables - after all, functions are just sub-expressions - which is something Code Complete specifically advocated against in procedural/OOP code. Some people seem to fall back into it a bit when they discover point-free style (and that seems to make up a lot of what you see in mixed-paradigm code). I don't think it'd be controversial to say it's bad practice in any paradigm, so the association of it with FP is kind of like judging web programming by late 90's beginner PHP code (which, at one point in time, did describe a lot of web programming, but it was never good, and we'd like to put that behind us).