@nikhil-dbx  as far as I understand that feature the idea is to provide a multi-fact pattern for Dashboards specifically for now.

I am yet to get my hands on the preview for Dashboard Relationships as they are called. I will update with a new article on LinkedIn (and maybe also here) as soon as I do. You can read more about it here

What I hope(!) is that this is the foundation for getting a true multi-fact pattern in Metric Views as well.
The current one using a bridge table with a cross-join of values suggested in the documentation today is not a real solution if you ask me.