Cloud environments, regardless of the specific deployment model used, have extensive and robust security controls in place, especially in regard to physical and infrastructure security. A small company can leverage the extensive security controls and monitoring provided by a cloud provider, which they would unlikely ever be able to afford on their own. Moving to a cloud would not result in any gains for development and testing because these areas require the same rigor regardless of where deployment and hosting occur. Regulatory compliance in a cloud would not be a gain for an organization because it would likely result in additional oversight and auditing as well as require the organization to adapt to a new environment.

DRM and DLP are used for increased authentication/access control and egress monitoring, respectively, and would actually decrease portability instead of enhancing it.

Explanation
Hardened perimeter devices are more useful at attenuating the risk of external attack.