Why doesn't HTTP2Connection.is_available check if _max_streams has been reached?

[ruanimal]

currently

    def is_available(self) -> bool:
        return (
            self._state != HTTPConnectionState.CLOSED
            and not self._connection_error
            and not self._used_all_stream_ids
            and not (
                self._h2_state.state_machine.state
                == h2.connection.ConnectionState.CLOSED
            )
        )

If _max_streams is reached, new requests will enter a waiting state.
However, in this case, the value of max_connections is usually not reached.
I think it would be better to create a new connection here.