Neuro-divergent and mental health labels serve two purposes: helping you find your people, and helping you find the right professional to aid you in building coping skills and/or healing from trauma and/or prescribing you medication.
So if you don't need to find your people, build your coping skills, heal from trauma, or take medication for your brain function, then there is no need for the label. But if you do need one of those things, finding the right label or set of labels is really important, and is often something a very self-examining person can do better than anyone else. Coping skills can mask symptoms and prevent correct diagnosis.
I have had medical professionals doubt whether or not I had ADHD because I made A's in school. It had to get so bad that I was distractedly driving through stop signs before they would medicate me, because my coping skills resulted in an outward expression of normalcy (grades). Never mind that my mental health and physical health was suffering terribly due to me using stress hormones generated by panic and not eating to help me focus.
I support people self-diagnosing, and will continue to do so as long as the psychology community continues to treat external markers of capitalist success as one of the most important diagnostic criteria. I will continue to do so as long as it is expensive and soul-crushingly difficult to find a therapist who isn't incompetent or abusive.