Magento2 API must use fully qualified namespaces?

In Magento2.1, I see almost all API use the fully qualified namespaces in the function param and PHPDoc, instead of using importing and aliases, like PageRepositoryInterface and BlockRepositoryInterface in the vendor\magento\module-cms\Api directory.

I forgot where I saw it, but I remember someone said Magento2 API must use fully qualified namespaces, is that true? If it is true, what is the reason?

For Example

<?php
namespace Magento\Cms\Api;

interface PageRepositoryInterface
{
    /**
     * Save page.
     *
     * @param \Magento\Cms\Api\Data\PageInterface $page
     * @return \Magento\Cms\Api\Data\PageInterface
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    public function save(\Magento\Cms\Api\Data\PageInterface $page);
}

Can it rewrite to below?

<?php
namespace Magento\Cms\Api;

use Magento\Cms\Api\Data\PageInterface;

interface PageRepositoryInterface
{
    /**
     * Save page.
     *
     * @param PageInterface $page
     * @return PageInterface
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    public function save(PageInterface $page);
}