[jeremiep]

Not only that but devkits also come with the SDKs and tools and access to the developer network. Plus they cost thousands of dollars. They also usually have double the specs of the retail console to run debug code and tools. Even USB connectivity and plugins for VS to debug code running on the devkit remotely.

Also on our Vita devkits there is no battery to make space for the extra ram.

Even with the open sourced compiler you're still missing most of the toolchain.