Did you know oxygen was once a terrible, toxic substance that was "bad for you"? [0]
It still is, to some degree. But cheap sources of energy always win in the end.
My point is that we (as humans) suck at processing some things and appreciating the true timescale of optimization. Our bodies fight old cargo cult wars, an exercise in wanton complexity. Hardly an argument against change.
I suspect the same applies to the "badness" of junk food and social media, except it has accumulated less baggage and hence can steer faster.
The fact that sugar and refined carbs (pasta/rice/bread) is bad for you is not even obvious to most people.