This question is related to the articles that are often cited in introduction or motivation section of any article. Often while writing an introduction, I mostly cite the famous works that are relevant to my work. Some other time I also cite the recent works from high-impact journals that are relevant to my work. This is primarily because these works are more show-cased and are widely available.
However, even though these works are relevant, is it ethical to just cite popular relevant works? What if an author published a more relevant work and it never got popular because he published in a low-impact journal? (This is refutable by saying: “Interesting work always gets cited and gets popular, irrelevant of the journal’s impact factor.”)