I've said this a few times. Here it is again. Every car that I test drove that had an AP nag because of a temporary lane line detection problem made me grab the steering wheel even though by the time I got the nag the system had already locked back on the lane lines.
The posts on here from people who have experienced or got second hand info from someone who did experience 7.0 indicate Tesla will operate the same way.
What should happen is if the system locks back on lane lines in short order, the nag should go away and not force you to grab the steering wheel for no reason.
You will know if the road you are traveling on is AP friendly or not. If it is then you only need to watch out for exit lanes, left hand turn lanes and merging lanes. If not, then you either won't use it or your hands will be right next to the steering wheel if not on the the steering wheel. You won't need any nags because you will be too busy correcting the AP to even see the nag.