They aren’t, and you can have separate schemas and changesets for your forms! In small apps I never feel this is worth it, but we do this at work with more gnarly forms.
Gotta call this one out as Changesets are not just about validation but also about, ahem, changes. Sure they go hand-in-hand, but so many Phoenix apps do a lot of parameter manipulation in the controller/LiveView layer before passing them to a changeset. I know it’s in many other apps evident by the number of people who ask how you deal with maps that may have string or atom keys… you don’t! You use the changeset API!
K, rant over.
