Slack Notification Now Has Text Field, Why?

I am curious as to why the text field has been added to Slack notifications. It looks odd and doesn’t render properly. It looks like it was added here:

Previous to this (we had v6.6.2) the text field wasn’t added and it was just the attachment itself. However it seems to be a new thing in ~v6.7.1.

Anyone have any ideas? Devs?

I’d still like to get some understanding on why this is. Thanks.