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there are also EJ & FA engines that had crank bearings fail in relatively low mileage on cars with both lightweight flywheel & lightweight crank pulley installed, requiring engine rebuild. So feel safe to compromise reliability of your car and your engine according to what subaru states. subaru, which most probably mentioned that for engines with stock flywheel and stock dampened crank pulley, not for one with aftermarket ones.
Boxer opposite engines may have least balancing/vibration issues and need least heavy flywheels/dampeners and no need for balancing shafts/weights, but still firing is not happening at all cylinders at same time and each firing twists crankshaft and puts extra load on bearings. Least need != no need at all. Going past reasonable may work on race engines where high budget and well equipped teams don't expect to last them past 10-15K miles prior rebuild/overhaul/replacement, but will not work for car daily driven or lightly tracked, but still owned by someone expecting it to last for 100K or more.
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