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I think this could be on topic if done carefully.  We don't want this to devolve into a popularity contest of everyone's favorite features.  Answers also can't be about opinions of which features "everyone should have" in general.

If you describe a particular application, it could be appropriate to ask what features are required or useful in a scope for that particular purpose.  Answer then shouldn't be just list of features, but explain why each recommended feature springs from the requirements.

Tread carefully.