I think the issue is solved by back markers being ghosted to cars about to lap them (if you can see the back marker, ahead OR behind, he should be ghosted to you) but
not ghosted to other back markers. He should be able to continue his race with those around him on the same lap without change.
The car about to lap the back markers should appear ghosted to them (so they don't change line for him) and he simply drives through them. And he doesn't appear ghosted to those close behind him on the same lap
In a perfect world, no, all cars would remain solid all the time! But games are not played by perfect people. The ONLY reason back markers are ghosted is, there are those that play for the sake of mayhem. The few have, of course, spoiled it for the many. But what would you prefer? That they be allowed to, or that the game acknowledge the problem and easily mitigate it?
I would hesitate a guess that no-one that has been deliberately taken out by a back marker would suggest that ghosting shouldn't be
comprehensive on cars about to be lapped. And only those that never had would still complain about ghosting..!
It seems PD has much work to do on ghosting issues during races. Last night at the Blue Moon daily I was racing in the infield, the car in front went wide in a turn, scrapped along the wall while driving in the grass (this was after the corner on the straight), I knew he was going to come back on track and probably spin so I gave him a wide berth while passing, I moved to the far opposite side of the track. I got hit in the drivers doors door while he was crossing the track perpendicular to the racing traffic and was rewarded with a 2 second penalty for my efforts. I feel his car should have been ghosted, it was beyond out of control and bouncing off of objects like it was the ball in a pinball machine. Maybe I will try hitting the wall myself next time a situation like this arises, maybe my car will ghost to avoid penalties.
TBH, this is a rather different issue than lapped cars ghosting. In fairness, I'm not a big fan of cars losing control ghosting to those around them on the same lap. As everyone can see, detection and judging when and how to go into ghost and back out of ghost seems utterly beyond either PD's ability, or the console's ability to do it well on a large grid (that's a lot of computation!). And sorry, but being collected by cars losing it around you actually IS pretty much part of real racing. It sucks, but it's real at least!
Back markers you are lapping taking you out deliberately, though, is NOT.
Ghosting should be used to deal with issues that real racing doesn't face, IMHO. But
not those issues that really exist...