Re: third-party retailers could still offer the affected iPhone models
"My guess is that it would be unfairly penalising third party retailers by depriving them of a revenue stream, when it is Apple that may be at fault, not the third party retailers."
A good lawyer would argue that you are advocating the safe and legal sale of stolen goods :-)
"I bought 'em in faith guv'nor!"
I suppose it all depends on where the 3rd party retailers are getting their Apple phones from. If they buy via a non-Apple agent/importer, then it makes the ban fairly pointless if the importer isn't banned from importing them. If the exception for 3rd party retailers is only while they sell existing stock, then it sounds reasonable.