I just read PEP 835 and came to show my very strong and excited support. 
This would greatly simplify the syntax needed in libraries that use Annotated, and the effort required from developers to learn how to use them.
If this is accepted, as soon as there’s a supporting Python version available (3.16), I would use it as the main recommended syntax in the docs for my libraries: FastAPI, Typer, SQLModel. 
Small link note:
The PEP at PEP 835 – Shorthand syntax for Annotated type metadata | peps.python.org has a link:
Discussions-To: Discourse thread
That points to:
https://discuss.python.org/t/pep-835-shorthand-syntax-for-annotated-type-metadata/107795
…which is a 404 instead of pointing to this same thread:
https://discuss.python.org/t/pep-835-shorthand-syntax-for-annotated-type-metadata/107814