dont forget that cocoonjs maybe is complicated but faster and performance accelerated using canvas + and support as well web-gl better than ejecta
It is not complexity the problem, it is than not only it is not based on a browser technology (ejecta suffer the same issue), it cannot be edited in any way possible by scirra (ejecta atleast can be modified incase of a big issue, I think crosswalk can also be modified too, and phonegap rely on the device itself to do everything), AFAIK there is no way to compile your application offline, or to an ancien version (crosswalk suffer the same issue I think, unless there is a way to mount a crosswalk app offline?), the memory management C2 does is not compatible with cocoonJS and it does not seem to be in ludei's plan to change that, also I think there are solutions to have advertisement and in app purchase in crosswalk and phonegap, not sure about ejecta though, so this argument is for iOS only, CocoonJS does not support all of C2's basic features, and if they do ANOTHER breaking update, user will complain to scirra once again, it is not about JS performances only, it is also about compatibility, you cannot make a big game on cocoonJS nor use all of C2's feature.
It should not be advertised as an export option of C2, since scirra has 0 control over it (ludei does not seemto care about the request of scirra, scirra cannot correct things by themselves, they cannot do anything, at least intel is listening, while crosswalk has issues, it is still better to make it work than to rely on cocoonJS, and ejecta can be modified in case of a big issue), and so should be depreciated (still usable, but not listed as the others exporters are shown) because it is not a main target of C2.
As for the main subject of the thread: The plugin is now maintained by a third party only (the community), so it is a third party plugin, but a note about that in the plugin description would be nice to have(with a link to the github maybe?).