The Yammer Bugs group proved its utility in O365 Network. Even though this network is not for bug fix, you WILL get posts here asking about things that are new, different, or non-functional. Community managers still often need to determine, with helpful input from others in different networks, whether something they're seeing is bug, test, or feature.
Our collaboration on bug identification speeds the identification and resolution of issues, benefiting not only us as your customers, but Microsoft as a provider of break-fix service.
If you don't give us a group, you'll simply see bug-driven activity littering your other group feeds that I'm sure you'd rather see targeted to other value-oriented topics.