I don't really get this. I've been on the normal firmware train since Xmas, and now in the June rollout of FSDb 10.12.2, and for me NoA was already very useable and useful 6 months ago, and I watched it progressively get significant better for me in the ~6 months since (and then no real change with my switch to FSDb firmware, other than onramp/offramp getting better with the stack transition. Without FSDb, it was confusing and inconsistent about what state it left me in after an offramp). When I say it got "better", an example is its handling of curved interchange roads from one metro highway to another. In January it often didn't slow enough in time for my comfort level and I'd disengage just before the turn-in point. It now handles those much better and progressively steps down its speed limiter as it approaches the curve.
Usually there's only two common reasons I ever disengage NoA on Houston-area highways (or roadtrips):
1. There's a couple of toll booths on Beltway 8 I've found where NoA just kinda freaks out. I think the booths must have been under reconstruction or changed layout since its last map update of them, or something. It more or less refuses to go through them on NoA and freaks out with a red takeover warning, etc. Many other similar toll lanes around the area work fine, though.
2. When the 85mph limit is an issue. There are some stretches (e.g. the northeast section of 99, from about I-45 to I-59) where it's just 2 lanes and it's common at some times of day for the fast lane to run mostly at ~95mph* in a 70 or 75. The car's 85 limit will causes issues with this no matter what (because it will try to pass slow-lane cars but not get up to the real speed of the fast lane either, so you're always being rude or stuck). In those cases I just go ahead and disengage so I can flow with the fast lane.
Without disengaging, I do "manage" its execution, though. I usually have to manually pick lane changes and/or canel lane changes it chooses to make a few times each drive. I sometimes give it a little gas when it's being under-confident speeding up for a pass, too. Still, I find it highly useful and it's almost always engaged on the highway.
* - Why almost exactly 95? Because we have lots of trucks and SUVs in our traffic, and it's common for them to be factory speed limited at 95mph, so this kinda becomes the common limiter for traffic as a whole unless the road is relatively-empty.