I have ADHD (diagnosed ~28 years ago, so well before "it was cool"), and honestly might kind of agree with you in that it could easily be a collection of neurodivergences that just get labelled ADHD. Add to that, lots of overlap with Autism spectrum[1], which probably has the same issue, and likely leads to misdiagnosis of one vs. the other, comorbid diagnosis, and the blunt categorization of neurological conditions which could very well be distinct, and at the very least sometimes have very different collections of symptoms into broader "ADHD" and/or "autism" categories.

[1]: https://neurodivergentinsights.com/misdiagnosis-monday/adhd-...