No, a pre-check-out is not mandatory. However, it is in your best interest to do one. We will inspect the accommodation and give you tips and guidance on what needs to be done before checking out.
If you are sure that you do not need a pre-check-out because you kept everything tidy and clean, you can request only to have the check-out. Keep in mind that if you do not have a pre-check-out, and there are complications with the check-out, you do not have an opportunity to clean or fix the accommodation.