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Subaru will advise you to raise the engine because
1) they aren't going to tell you to work on a car because of tight spaces... if you have no room to work with, you increase the chances of damaging the customer's car
2) it's better to have more space because it gives you a better chance of getting an accurate torque setting with a torque wrench
3) reduces liability
As for unbolting the parts listed, it comes with the territory of properly working on a car. In practice, most mechanics will take shortcuts.
-alex
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