It would work if you will use forums. But i don't must to install and purchase additional app that I don't need, just for solving trouble with missing comments widget.
All that I or we need here - it is the comments widget.
It is so sad that when you think - ok, we have Pages like cms, ok, I will use it instead of something else bcz I like it - and then oops - you detect that some basic things like a comments widget - are missing. In the end of 2018, after so many years from 4.* release. Still missing.
How is it possible?