For now we still export them for all EAPIs but maybe for the next eapi we could kill them. At least src_unpack could be killed without much impact, for src_compile (that is widely used currently) maybe we could still keep it as maybe in a future we need to tune it for something :/
I would personally kill gnome2_src_unpack as it doesn't have any users and I don't see any scenario needing this in a lot of ebuilds (the general changes will usually land into gnome2_src_prepare) Regarding gnome2_src_compile, we could keep it as maybe we can still use it for something useful and I feel a lot of people will try to run something like "gnome2_src_compile -j1" for example (to prevent parallel compilation bugs)
[master dc527ce] gnome2.eclass/gnome2-utils.eclass: implement eapi6 support and take advantage of that for finally fixing many bugs/enhancements that were waiting for this (#571378) 2 files changed, 113 insertions(+), 47 deletions(-)