In short:
Image/video related to your interest = dopamine hit. Constant dopamine hits = addiction. Addiction = depression, less braincells, mental illness.
Text only = none of the above because no image/video = makes you think. And thinking is (obviously) good.
Something something “the human brain wasn’t made for constant dopamine hits that an automated system provides”. And not being addicted to such system makes you a better human (non-addicted, critical thinking individual.).
Or, in other words – we are made to conquer. Not being conquered – specially by machines.