Maintaining the parameter validations in that role is a dead-end: it will be a growing list of blocks with `when` conditions, to a point no one will dare adding nor modifying and assertion.

Seeing this, the decision is to:

• remove all non-core validations
• document that new behavior (template will fail if you don't pass the expected/required parameter)
• ensure new validations, if any, are generic enough to apply to any VA/DT (hint: we don't expect any new validations in there)