Why are "Self" credits still treated as the lowest of the low on IMDb?

Not a fan of the new web design, but there are plenty of threads about that.

What I don't understand is why "Self" credits remain second-class credits here. A person with 20 "Self" credits and one "thanks" credit has the "thanks" credit as the main entry on their page, with users needing to click the tiny "Self" button to see those credits.

Why doesn't the category with the most credits get treated as the default category for any given person?