Building a Kimball dimensional model with dbt

This is a companion discussion topic for the original entry at Building a Kimball dimensional model with dbt | dbt Developer Blog

Hi folks!
A great article, thank you for compiling it all together!
Was confused by one moment : seems you suggest to create a visual ER diagram as only part of documentation, Part 6.
Typically I start with visual ER diagram , and even use it to generate tables DDLs and even dbt code(If I work with dbt).
Any reason you put it only at the end? Will not data engineers benefit from having it in from of them even before they started writing any dbt code, dbt tests etc ? Thoughts ?