Image roles are used to assign particular mission to images, like thumbnails, background and small images. You'll learn how to add image roles to a product image in magento
Magento 2 uses etc/validation.xml file to define validation rule for a particular group. Though the usage of this file is not widespread, it could be nice to see validation in a single place. In that way they could be more managable.
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While EAV attributes can be managed by admin it can also be put in setup scripts and be ready with the deployment without any manual operation. This is useful especially if you deploy your code couple of different environment as you wouldn't want to go and manually add attributes for each environment.
Magento provides encryption mechanism for sensitive data saved on adminhtml. Encrypted fields can be used to save sensitive data like API Access Keys.
Magento system configuration is formed of env.php, config.php an config.xml and DB
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