Latin Word Order • Verb-Final is less common in numerous Latin expression types, such as: Copula Verb, Existential Verb, Imperatives, Subject Complement, Interrogatory and etc., where Verb-Initial, Verb-Medial or Verb-Penultimate is vernacular.
Verb-Final is less common in later than in earlier era writings. Some Latin authors use Verb-Final only 25%. Some earlier authors, who used Verb-Final for some expressions, used Verb-Final for other expression types only 35%. Verb-Final is used less in main than in subordinate clauses.
Synthetic Latin Grammar allows flexible Latin Word Order and versatile communication.
No, it's not mandatory.