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One "needs" rear lca if one needs rear camber adjustment.
Common cases are if one needs performance oriented alignment, if one wishes to change handling for specific result, if resulting camber is too different side to side, if one wishes to dial back negative camber from lowering to stock values. Well, and if specific camber is needed for wide tire/wheel clearance.
If it fits none of the above cases, of course there is no need adding adjustability feature in way of aftermarket adjustable rear LCAs. I find that adding camber adjustability is nice thing to have even for non tracked stock cars, as stock alignment can be rather uneven and alignment out of whack can impact handling in negative way even when daily driving. In cheapest form of front camberbolts + cheap LCA (like spc/whiteline/eibach) it's not THAT expensive.
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