It isn't a real issue now. AP is driver assistance, not driver replacement.But given some of the AP issues/accidents due to partial lane incursion detection issues (for example the tow truck partially in lane here), it's not clear the AP today is providing that net positive. Perhaps this will be fixed soon and so this isn't a real issue???
Honestly looking for a reason to keep my delivery, not cancel - it's in most ways an amazing car.
As with all systems there are going to be corner cases or odd circumstances that aren't handled.
But as others have already pointed out, the Model 3 is still one of safest cars to be in just from its passive systems.
So even if AP doesn't react to a lane incursion (like any car without AP) you'd still be safer in a Model 3