I think in practice a lot depends on who are you working with now or who you might be working with in the future.
Just for yourself? Go nuts using functional concepts if that's what you want.
With a team that's got a lot of experience and knowledge of FP concepts? FP might be a good choice.
With a team of mixed skills, possibly where you don't know who will be hired in the future? Might be worth being more conservative in how you code, OOP, imperative with a sprinkling of functional concepts e.g. map/filter.
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I think in practice a lot depends on who are you working with now or who you might be working with in the future.
Just for yourself? Go nuts using functional concepts if that's what you want.
With a team that's got a lot of experience and knowledge of FP concepts? FP might be a good choice.
With a team of mixed skills, possibly where you don't know who will be hired in the future? Might be worth being more conservative in how you code, OOP, imperative with a sprinkling of functional concepts e.g. map/filter.