When I was a second grader, I was subject-accelerated in math. For the next year, the school suggested I skip third. My parents let me choose, and I turned down the skip entirely because 3rd was the year you learned cursive. (It's not clear to me whether anyone asked me why I didn't want to skip; they didn't offer to hothouse cursive over the summer as a solution to my objection, in any case.)

IMHO, it was a bad decision. I never had any challenging work until I got to high school, and got involved with competitive extracurriculars. And when I got to college, I intentionally avoided classes where I'd have to struggle to understand the material.

I sometimes doubt our decision to skip DD8, but based entirely on anxiety about problems that might arise later on. For where she is right now, it was clearly, clearly the right choice.