AP does nothing for NO reason, you may just not understand why it is doing things and it might not align with how you want to drive. This is the price we pay for being on the early adopter curve, some releases are better others worse. As a side note, I realized a couple months ago that we (humans) will have to retrain how we interact with our cars if we want self driving to be a success. Like you say, it may not crash but not what you were expecting...I find it changes lanes when I wouldn't have, but then so does my wife...which makes it impossible for Tesla to make it do what YOU want all the time. This doesn't include jerkiness etc which will get ironed out in time, and is more what you are talking about.
In my experience, swerving lanes and coming back is typically because it thinks you aren't holding on, so make sure you are applying a bit of torque. I've only had it cancel lane changes when someone behind me did something unexpected enough it was worth a second look. If it truly is a digression, wait for the next update since 32.2.11 definitely doesn't do that. I've seen in the past that when they add new edge cases, things get less smooth for 1 or two updates until they have worked their sauce a bit.
FYI, your headline is alarmist and reeks of attention seeking. You very easily could have named it 'Unexpected accel/braking in NoA'. Chill out.