Label field and why it’s function is not clearly defined.

As a Travel Photographer, I have 26,000 images. I populate the keyword, title and caption fields. Additionally, I have used the Label field for identifying specific subjects such as “church”, or someone’s name. Only recently, I used the Text search across 26k images to locate a subject. I found that not all images with a Label Keyword came up. After a very helpful dialogue on Adobe Forums, I learned that the Label field is to identify colour labels only. So my question is, Why doesn’t the Label field have a pop-up note defining its purpose, or in the alternative, a drop-down with executable choices?