This is probably just a weird pet peeve of mine that nobody else notices or cares about.
It really bothers me when people refer to loose powder eyeshadow as "pigments". Really, it's all MAC's fault, giving a finished, blended product such an inaccurate name.
Pigments in terms of manufacturing are coloring agents. An iron oxide or red #40 are examples of pigments. Now I see all kinds of beauty bloggers, YouTubers and even trained makeup artists calling every loose shadow a pigment.
The companies that make these products have them clearly marked and always referred to as eyeshadows, so I really don't know where these people are getting it into their heads to call them anything else. And when you think about it, it's insulting to the formulator of an eyeshadow that they worked hard to blend, creating their own unique colors and a functioning base. To say it's a pigment is inadvertently accusing them of repackaging.
Naturally I don't believe this was anyone's intention, likely they are simply misinformed.
Just my two cents.