What sizes do I actually need in a mixing bowl set?

Mainstream tech and food publishers we read converge on a three-bowl core: a small (around 1–1.5 qt) for whisking eggs, dressings, or prep; a medium (around 3 qt) for batters; and a large (5 qt or more) for doughs, salads, or tossing. Larger sets with 5+ bowls add nesting prep bowls that are useful but often duplicative if drawer space is limited.