My first tests of 11.3.4 over the weekend, overall impressions:
1. Overall, it seems like a big positive step forward. A lot subtle-ish things got much smoother/better even on city streets, and the new highway code drives much more naturally than NoA did when cruising in traffic.
2. Love the right-scroll wheel adjustment to switch chill/average/assertive and button to temporarily minimize lane changes. That's super-helpful at this stage!
3. The many lane-choice issues don't seem to have improved, sadly. Sometimes it doesn't get into the correct lane early enough for an upcoming turn, leading to predictable problems merging into slowing traffic later. Sometimes when a single lane splits in two shortly before a right turn, it choses to split left first, then immediately lane-change back to the right. etc. This stuff is just as bad as it was on 10.69.
As for "new" issues:
1. While some stop-sign intersections are being handled better on the "when and how to take off after stopping" part, I've had a couple isolated cases where an upcoming stop-sign (on a ~35mph road) is clearly visible from a great distance, yet it waits until waaaaay too late to even begin slowing for it, resulting in an unacceptably-aggressive stop once it gets there. I was on "assertive", but I don't expect "assertive" to mean "drive like an idiot and slam on the brakes at the last second for stop signs"
2. In at least a couple of cases, I've observed it fail to take a right-on-red that it used to take before. It comes to a stop at the red light and seems to be waiting for a green, even though there's no visible oncoming cross traffic. Had to go-pedal it through to avoid angering the stack of cars behind me. I didn't wait for more than a few seconds, but it was already very unnatural, so I'm not sure if it would've eventually gone or not.
3. Onramp/offramp speeds for highways seem to have new issues that make it unacceptable in traffic. Common scenarios here have e.g. a feeder road at say 45mph with ramps to a freeway at say 75mph. When onramping, it seems to hang onto the feeder speed setting until the very end of the ramp, then suddenly switch to highway limit just as it's merging. This is very abnormal and traffic-disrupting here, as everyone expects that we all start accelerating at the start of the onramp. Similarly, with some off-ramps, I've seen it start slowing down what seems like maybe up to 1/8 mile /before/ entering the offramp, whereas normal human behavior here is to maintain highway speed till your car is out of the highway lane, then begin slowing (I think I saw this latter problem a little bit on 10.69 as well, but it seems more-pronounced now). I imagine this is all somehow inter-related with the NHSTA fixes for limit-change reactions, etc.
Still, overall, it really seems like things are improving in the right directions, and my disengages are much fewer!