Purpose of Schema-Woven Validation | WordPress.org

Please explain purpose of Schema-Woven Validation. In the old CF7, we had validation on the wp backend /wp-admin/admin.php?page=wpcf7

The validation stays with the form, it is specific to the form.

Then you changed it, so all validation is saved in the theme php. We copy form id to the theme php files, and it affects all forms in all sites using the theme.

Now you make SWV and move validation to the form again? Why going backwards and forwards just making changes and changes?