[Kesslan]

Well there's other options like that too.

Either way there's a number of ways to cut down on or punish the overuse of such tactics (Spirits, enemy mages, going underground, wards etc). I don't punish people for using an idea like that to get around specific situations but you can bet if they use it as an every day tactic the odds go up significantly that it's going to backfire on them some how. Otherwise the 'while you were out' entry for astral projection wouldn't be there in the first place.

[TheNarrator]

Any mage who astrally projects for any significant length of time without putting his body behind a ward first should be fully prepared to come back to find it missing. Shedim body-snatching has been a known danger for more than a decade, and mages know to protect against it.