It is vice-versa in our community.
When atting someone, you may write something about their relevant experience that they probably might not want to talk about in that particular topic.
Not everyone might like when you force-invite them by mentioning in a topic. This may make others think they the invitee ignores the invitation.
The main point, though, is that they might not like the introduction you make about them in context of the topic. I prefer people do it on their own. And I prefer giving the flexibility to silently ignoring my invitation without traces in the topic, so I just use “Invite” button, that’s all.
But I use it “intelligently” 
I only invite people when they are online and …
…let me avoid content duplication, read more about how we invite people to participate here: