I can definitely relate to that. I can think of some things that are probably at play:
what is unknown can appear as scary
the common myth that FP is somehow harder than OO; I would say this is more to do with education, which is better in OO than FP. OO also receives much more focus.
FP is sometimes perceived as elitist
for some areas FP might not be the best pick, if your main focus is to get something done as quickly as possible; For example, there is a very handy State of the Haskell ecosystem post, in which Gabriel Gonzalez rates Haskell for each programming area. For many applications the trade-off can be diminished if you're planning to support them for some time, which we usually do anyway.
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I can definitely relate to that. I can think of some things that are probably at play: