Have you noticed that there are only two, em, industries which use the word ‘user’ for a human? Drug and IT are the two.
Language is hard for everyone, even for professional writers. The language that we use shapes our realities because we don’t have better way how to describe what we are experiencing.
Note: When I say language I mean sounds produced by vocal chords and hands and also pictures used by non-verbal humans because that’s language too.
So, please, don’t use it. We already have several words which we can use instead of user. Human or person are both better because we can imagine someone behind the word because we are all humans and persons. On the other hand behind the word user is a grey silhouette with which we can’t really empathize with.