The environment being so carefully controlled to be the same is kinda one example. I don't think it's as identical as they are claiming — behavioral science is

The environment being so carefully controlled to be the same is kinda one example. I don't think it's as identical as they are claiming — behavioral science is littered with these claims that are later shown to be false — but showing X percent of variance associated with the individual in the absence of environmental variation is not the same as showing X percent in the presence of significant variation. Let's say you tried to change some of the fish, for example. It's an interesting paper but full of big-picture issues.