How can I use the HTML5 date input fields? According to https://docs.metabox.io/html5-input-types/ this should be possible, but if I use 'type' => 'date' I end up with the jQuery datepicker instead of the native datepicker.
For the date picker, as the plugin already supports a custom 'date' field, so it's not available to use default HTML5 input types. In short, the field types that are already supported by the plugin will overwrite the HTML input types.