I personally don't think there are any advantages. People tend to have a default setting that leans towards denial or intuition, in my experience. If they lean towards denial, they're not gonna have any empathy for you whether they know your diagnosis or not, they will just be resentful towards you whenever you're not 100% functional in whatever context. If they lean towards intuition, they're gonna be thinking that you must be struggling with something (when it's obvious) and have a little patience with you, whether they know your diagnosis or not.

I would say the only exception is children, because children are naturally a little more self-focused for survival reasons and may not be able to grasp how difficult or overwhelming adult life can be, so they may be more likely to take bad moods personally. So I think it would be worth it to make sure children involved understand that their parent sometimes has bad moods but it's not the children's fault in any way and doesn't mean the parent is upset at the children.