Even though #14372 migrated CLI packaging system to PEP 420 Implicit Namespace Packages, In Azure CLI installed by Homebrew, azure and azure.mgmt still have __init__.py files:

cat /opt/homebrew/Cellar/azure-cli/2.34.1/libexec/lib/python3.10/site-packages/azure/__init__.py
__import__('pkg_resources').declare_namespace(__name__)

cat /opt/homebrew/Cellar/azure-cli/2.34.1/libexec/lib/python3.10/site-packages/azure/mgmt/__init__.py
__import__('pkg_resources').declare_namespace(__name__)

This brings problems:

1. azure namespace package installed by extensions won't work: Dataprotection ModuleNotFoundError 'azure.mgmt.resourcegraph' azure-cli-extensions#4562
2. This defeats the purpose of migrating to PEP 420
3. Loading time of pkg_resources is slow and this slows down the execution speed of Azure CLI