The post continues the previous one, where I was trying to compare Groups with Teams. Despite the comparison was possible, Office 365 Group is not, what I underlined then, a standalone application, but a security object. Remember also, that Office 365 Groups were first introduced somewhere in 2014. Over the years it was being extended to work with other Office 365 based applications as well to be used in hybrid scenarios with on-premise Exchange.
Since it’s very beginning the narration that Microsoft was building around the concept was, that it is a tool dedicated for groups of employees, that delivers tools assisting and helping in their ongoing work, collaboration and communication.