Sagging roof linings are a problem that spans many make and models. To be fair to the manufacturers sometimes there is no substitute for time out in the real world climates to test things to destruction point. By the time that these failing roof linings and, (as another example, peeling clear coat on the paint work) show up, the cars are usually years out of warranty. At that point it's not really their problem anymore. After all, they are selling new cars not second hand ones, so it's not likely to effect their sales.
Something else to consider is that manufacturers are being pushed to produce "green" vehicles that are easy to recycle or biodegradable. You see a lot of BMW's here in New Zealand from the late 90's on that had badly perished seals round the windows, the roof linings are known to commonly sag, and pipes to the windscreen washer just fall to bits.
And that was on 10 year old cars.
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