Actually, the bushings and seals can be opened, repacked and closed again, but Porsche doesn't recommend this... they'd make no money doing that.
The shop that said they replace them all the time is a race-specific shop. My car was one of the only non race-dedicated Porsches in the shop at the time. I do not believe they use race-designed control arms on our cars as of yet. I could be all wrong on that, but if they did have better ones I am sure he'd have told me about them to sell me a pair... this shop owner is a sharp business man.
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