As per discussion in JBDS-2649:

Max said:

we are close to GA to fix this and this is a "bug" we also had in JBDS 6.

The content is more or less "dead weight" and should be removed but lets do that in 7.0+

but lets make sure we separate installer.jar from updatesite.zip in docs/and uploads so
it is not considered the same since in time installer.jar != updatesite.zip.

Denis said:

+1 to postpone that to 7.0+