It is definitely a spectrum mental health condition, in my opinion. BP presents differently in each person. In fact, I find it very interesting how personality differences, upbringing, life experiences, and other factors can contribute to differences in its presentation.

Also, I wouldn't say that BP1 is more "severe" than BP2. Plus, severity is something that's really subjective. This is why it is so important for mental health professionals to provide individualized care, rather than just treating general symptoms.