I fall into this category. I’m one of a bunch of kids. By the time I came along I think my parents were just DONE with paying for braces for siblings that really needed them. So while my teeth look ok, my bite isn’t good which then affects other areas of my mouth.
My dh fell into his teeth were straight enough category. He could have benefited from braces as a child. His bite is somewhat off and as a kid he would have likely gotten an expander. I had braces since my mouth was crowded and teeth were growing in crooked. I didn’t like it at the time but I am glad my parents made me go through with the braces.
My oldest has braces. He had a severe overbite plus recessed bottom jaw. It’s been corrected with a herbst appliance with expander. Huge difference. His top teeth no longer hit his lip anymore.