One would think people "whine" here just because all you see here is posted problems and complaints but that's only because they CAN do that here. They have a captive audience here who also own FWD/AWD Volvos so those people can also relate. The RWD forum here looks similar, just with older cars but not much different in the "whine" department really.
As for turbos and oil leaks, the turbo 850 oil leaks don't really have anything to with its "high pressure" as that term only applies to the boosted air pressure, NOT oil or crankcase pressures. The #1 turbo oil leak, the drain tube o-ring is under LOW pressure and leaks due to poor quality of the rubber used. As for rear main seals, those eventually leak in both turbo and NA 850s (like ALL cars really) and also has nothing to do with the turbos "high pressure".