First of all, I think we shouldn't remove the deprecated API until version 1.x is released. There are projects that still use it:
https://github.com/search?q=SocksConnector+language%3APython&type=code&p=2&l=Python

Secondly, there is no need to add type annotations to the parameters of "private" methods (_wrap_create_connection). Users of the aiohttp_socks package will not benefit from this.

Thirdly, there is no need to explicitly list all possible parameters in the signature of the __init__ method of the ProxyConnector class. These parameters have nothing to do with ProxyConnector. This complicates its maintenance.

Fourth, you do not need to import third-party modules (aiohappyeyeballs) that are not used in the ProxyConnector implementation.

Fifth, some type annotations appear to be incorrect (username: str = "" should be replaced with username: Optional[str] = None etc.)

In general, from everything you suggested, I would leave only parameter type annotations for methods that are public API of the ProxyConnector class (__init__, from_url)

Take 1

I decided to look at projects that use the old API and got the following table:

etc

As you can see, all packages using the old API themselves have long been outdated. In live projects, it can be easily changed to a ProxyConnector.
If you are interested in supporting such old projects, no problem, I will return the old API.

Take 2
I totally agree, I'll change it.

Take 3
I have doubts here, it makes it easy to throw parameters into the class, but I also understand your position with maintenance. I think I will also change it

Take 4
Because the library relies on aiohttp, which uses aiohappyeyeballs, I took the type annotation directly from the aiohttp.
I agree here, I'll change it

Take 5
This types and initialization was done on purpose, because the library uses python-socks, which expects not Optional[str], just str.

Take 1

You are not taking into account projects that are not hosted on github
...

Take 5
...because the library uses python-socks, which expects not Optional[str], just str

It is python-socks mistake, which should be fixed later. A public API should not depend on implementation details.
For the same reason, please import SSLContext from ssl module directly (not from aiohttp.connector).

And please remove cast call from from_urls method body, it would be better to add type annotations to python_socks.parse_proxy_url later.

And return the deprecated APIs

You are not taking into account projects that are not hosted on github

Of course not, because i can't review them)

Ok, I'll just reopen the pull request with minimal changes.