Of course you need Danish in Denmark and it is reasonable to speak Danish in Denmark. But the expectation nowadays is generally that one will practice the language e.g. in a course or with a patient partner and their patient family until at least the B1 level (and ideally B2) level, and only then impose one's imperfect language skills on the general public. At that point, one is no longer quite "practicing" or trying to use a language that one cannot claim to speak yet.

I travel the world for language practice and don't feel too embarassed because 1) I try to get to a B1 level before talking, and 2) I travel in a way that brings me into contact with a lot of elderly people happy for any social contact and novelty. But I am definitely aware of the need to avoid inconveniencing younger people.