I'm surprised every time someone says:

1: This field requires a lot skill.

2: I am not skilled in this field.

3: It's obvious to me <observation that might require skill in domain>.

And then there's no appeal to an expert in the field, or observed behavior.

It's fair that sometimes negative effects are obvious, and if the writer was observing the deleterious effects of the button placement, I could see where they're coming from.