We can all talk and be flippant about how trivial it is to change the colour of a button or whatever, but the sum total of all these changes is something different.
These services are running huge numbers of experiments in order to maximize engagement. Then everyone wonders what happened when tons of people on Facebook end up depressed and tons of people on YouTube end up radicalized by extremist rabbit holes.
That's a separate problem though. The solution for that isn't to do something at the level of the individual experiments, it's to do something at the agglomeration level where the trivial individual harms are actually accumulating.
If you have some food which is infected with salmonella, you don't pick it apart with a microscope at the level of individual cells and try to separate it back out, you just throw the whole thing away and eat something else.
In this context the contaminated food is Facebook.
To continue with your analogy, Facebook is just one tainted chicken breast in the meat counter. We need to examine the entire meat packing and inspection infrastructure that gave rise to this mess.
These services are running huge numbers of experiments in order to maximize engagement. Then everyone wonders what happened when tons of people on Facebook end up depressed and tons of people on YouTube end up radicalized by extremist rabbit holes.
It's death by a thousand cuts.