My narrative (based entirely on hunches) is that it has become very trendy in social media to assign any “strange” behavior to mental disorders like autism, adhd, bipolar… Conveniently, the same social media that thrives on cultivating these behaviors. Short attention spans, niche interests, and mood swings are all part of the SM addiction machine.
So social media says “you might have ADHD if (insert normal thing)”. People self identify, and now watching videos for 4 hours can be chalked up to the mental deficiency instead of the addictive substance.
Over-all this trend to me is a way of relinquishing responsibility, since it’s “just my brain” it is outside of one’s locus of control.
There is also more pressure now than ever to be a rational economic agent, and compared to that most of us have forgetfulness, procrastination, social shortcomings, moods that are not conducive to being an employee, etc.
I have a hard time believing that modern people are any more mentally challenged than those in the past, we are just much more quick to pathologies normal human experiences. It is convenient that this pathologizing is a boon for TikTok.