It comes out because even if its still good now, eventually it won't be and then it kills the tensioners.
Its there to stop little bits of carbon or oil sludge which may build up post-filter from going through the tensioner, however those little bits of carbon (should there be any) would clog the gauze and then the oil pressure would just punch them through it. At that point both the carbon and the stainless steel wire go through the tensioner and destroy it. Overall, its preferable to keep the oil changed regularly and let any post-filter detritus just go through the tensioner.
This is fairly standard Audi M.O. and they are still doing it now. It killed a lot of W8 Passats because it was a £10K repair at the dealer. Ditto the W12 although more of them survived simply because the host vehicle was worth more at the time. Its also what kills the turbos in the 4.0TT. They have a gauze in the turbo oil feed to stop particles going through the turbos. Instead, the particles clog the filter and stop oil going through the turbos which kills them in short order. Another £10K repair. The US has a recall for it, presumably due to the threat of a class action suit, but Audi UK don't care and refuse to do anything about it or even contribute to repair costs.
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