To which I say, "if you're not going to pay attention, don't drive a effin' car!"
Every time I turn on FSD I listen for the double chime and glance down at the screen to verify that it's engaged. Every time I turn on TACC I listen for the chime, check the set speed on the screen and hold my foot over the accelerator until I've verified that it's engaged. Every time I use cruise control on our other car I do the same.
When I'm using FSD I'm watching the road with my hands next to the wheel so I can take over if it does something stupid. If it disengages it gives an audio signal and the screen changes and oh, I happen to notice as the car starts to drift out of its lane and I take over immediately.
Now what they've done is make it so you can't use TACC at all but you can still disengage FSD just as easily. One can argue that it's even more dangerous since it will suddenly stop in the flow of traffic and since speed control is so horrible with 12.3 you just assume it's messing up anyway.
Sorry, I have no sympathy for those who don't pay attention and can't figure out what the car is doing.
I've said this before: I think that steering wheel torque as a disengagement cue was a mistake. A contact sensor on the wheel would be OK, I think, but torque from the driver should mean "change turning radius".
In an airplane autopilot, pushing the controls overrides the autopilot and changes the plane's attitude, and when pressure is released, the autopilot returns to the set heading and altitude. Some cars work the same way. But since the power steering senses torque already, Tesla saw a "free" way to sense attention. But this created mode discontinuities: In manual mode, an increase of torque on the steering wheel causes change in turning radius, while in autopilot, a slight torque means you are awake, but more torque means disengage autopilot. Disengagement this way causes swerving, as does stalk or brake commands disengagement during a turn. In either of these cases, disengagement causes abrupt, and usually inappropriate steering changes.
If instead, steering wheel torque merely overpowered the autopilot momentarily, one could dodge a pothole or other traffic, and letting go of the wheel would let the autopilot return to the lane center smoothly.
But Tesla has chosen the "free" sensor approach. Perhaps, if the interior vision proves effective, they will eventually rely on that rather than torque.
Till then, it is what it is.