Debian Switching Back To GNOME As the Default Desktop
An anonymous reader writes: Debian will switch back to using GNOME as the default desktop environment for the upcoming Debian 8.0 Jessie release, due out in 2015. The decision is based on accessibility and systemd integration, along with a host of other reasons. Debian switched away from GNOME back in 2012 .
You need to look into it deeper. It didn't happen that way at all.
Canonical wanted Debian to pick upstart (naturally as it was their software). Once Debian chose systemd though and with RHEL already switching away from upstart to systemd, Canonical felt that being left as the only distro still using upstart wasn't tenable any more. Staying aligned with Debian was more important than getting what they wanted.