SAT subject tests are NOT truly optional for middle/upper middle class applicants at elite colleges!

I am new to the blog so apologies if this is a silly question. How do you think about the subject tests if you are turning in AP tests in the same subject. For example, if you got a 5 on the AP test in chemistry is there any benefit in taking the SAT subject test in chemistry. If you are turning in say 4+ AP tests, are the SAT subject tests more optional.