I think it varies but my hair in general has gotten less curly toward the roots now that it is longer but it looks better overall I think because it has nice curls down about halfway toward the bottom to the ends and I am finally rid of that pyramid look
It depends. Everyone has a range at which they will get the most curl. My hair is classically 3A in the sense that it isn't as curly when it's shorter. The ends start spiralling more at a certain point. However, when it's really long, the weight pulls on my roots and makes them flatter and straighter. Regardless of the length, layering helps to minimize that (for me, at least).
Hair: 3A/B, Underlayer of 2B
Winter- Giovanni Tea Tree (co-wash) & 50/50 (condish); Curl Junkie Curl Assurance Leave-In; Curls Milkshake & Quenched Curls; Re:coil; BRHG
Summer: DevaCurl No Poo & OneC; CK; Re:coil; BRHG; Honey!!!