I’m guessing the benefit of taking the slip out of the socket is that once the LCA is bolted in place, it’s true that the socket can’t move but if there’s slop there, the LCA can move on the socket.
Yeah, with weight on the adjusters the socket and LCA shouldn’t move independently as a whole assembly. But, the slop around that socket is space for the LCA to flex into or around on. The less space there is, the less room there is for twist/flex/deformation.
That’s not something you’ll notice driving around on bias ply’s, which is why the factory wasn’t too concerned about it. But slap some big wide modern radials with a 200 treadwear compound and 300 in/lb torsion bars and you’ll find all kinds of things get flexy.
