It’s relevant because Google announced it is going to shut down Hangouts in 2020.
They have since also announced that there will be two new different versions of Hangouts to follow in its footsteps. But it remains to be seen if those will catch on. Their other messengers didn’t, after all.
So, no, I’m not saying this because of hippieness or anything but because Hangouts is actually sentenced to die.
This made quite the news back then (many months ago), so I assumed this was common knowledge.