Medical terms will usually be negative. That's the perspective you come from on the treatment side. Identify and name a thing that is wrong in order to drive effective treatment. Hence the very negative term used by the DSM.
As far as the lived experience, euphoria can be easier to identify for some. If you're a trans adult who is unaware, the feeling of dysphoria is normal. Its the baseline. It can be very difficult to notice when your baseline is wrong because its what defines your perspective.
Since starting HRT I've learned many things were dysphoria that I assumed were just normal.