The current implementation of the agl-devel feature to enable developer support has a few issues:

• It is defined in the metadata as a distro feature, which is high impact with respect to the sstate in Yocto.  It should likely be shifted to using AGL_FEATURES as has been done with some of the other features.
• The attached configuration changes touch some IMAGE variables at a global level, which likely has fallout for downstream attempts to do builds involving initramfs or other images or when using multiconfigs.
• There are quite a few places where agl-devel is used to drive adding packages to a packagegroup.  These pretty much all need to be removed to make doing a binary packagefeed more feasible, and doing so would also help with respect to sstate management in general.