the local acknowledgement is required; since it allows packets to be sent without waiting for an acknowledgement from the remote side; it should usually increase throughput, but should not affect your current connections.
As for flow control, that is an optional feature, and not required.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...