The only disadvantage of the earlier adjusters is sometimes they would over adjust. It wasn't a big deal, and they didn't advise retrofitting the earlier ones. although you could. Nothing wrong with NOS.
Right. So sometimes they would overadjust, and then the rear brakes would lock up well before the fronts if you needed to do a panic stop. A problem that these cars and drum brake rear cars in general have anyway.
They redesigned them for a reason then. All the more reason to use the later set up.