I'm a little confused. How would loose rings cause cylinder wall wear? The piston would rock regardless; most of the piston surface is below the rings, and would have a cushion of oil, regardless of what the rings are doing.
With PFI I'd think oil in the cylinder would cause problems, oil tends to effectively lower octane, right? but I'm not sure what happens with DI. I'm guessing very similar thing, which with higher cylinder pressures would seemingly cause problems quicker. Just a swag though.
Nothing new with low tension rings though, been around for a while. And last I knew, back when we had non-low tension rings is when we had cylinder wall wear issues.
[Apples and oranges I know, oil 20-30 years ago simply did not compare with what we now have.]