Ansible directory structure - playbook sub directories - alternative structure

Archives Ansible Project
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On the Ansible best practices page it lists a suggested directory structure - https://docs.ansible.com/ansible/2.5/user_guide/playbooks_best_practices.html

I’ve only recently started using Ansible, and so far for this massive project I’m working on I’ve created a playbook directory - and within this I’ve created sub-folders. An example I’ve provided below.

.ansible
ansible.cfg

— inventory

– dev.yml
– test.yml
– prod.yml
— playbooks
— App1
— play.yml
— scripts
— vars
— files
— DomainController
— GIS

Why is it suggested to have all plays at the root (or within a single folder)? Is there anything wrong with the approach I’ve taken so the plays can be grouped by “project/purpose”?