Understanding Model.DateTimeInsertFromDate and Model.DateTimeUpdateFromDate Optionality

If I am not understanding correctly, please correct me. The insert type of a model created with Model.Class that has a field with schema of Model.DateTimeInsertFromDate does not make that field optional. It is also the case with Model.DateTimeUpdateFromDate. Is this the intended behaviour?
playground link: https://effect.website/play/#f9a1f3dc332c
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