Still, on the subject of checkout page usability, attention should be dropped to the checkout form fields, namely, the address fields.
The recent checkout usability testing shows that an ideal checkout flow can be as short as a 12-14 form element. If that's the case, then there's need to define what the fields are really necessary.
While Magento 2 doesn’t support adding extra fields to be shown in checkout customer address form, we are here to help you. Look at the way - the Magento 2 Address Fields Manager extension.
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