Because The Catalyst doesn't want to stop development at all, it wants to stop development past a certain point. Remember: it's designed by the Leviathan, who want 'tribute'. The Leviathan had no interest in stopping development, their only concern was that their thralls ended up dying past a certain point of development.
Of course, this is something of a risk for the Reapers, one they finally rolled snake-eyes on in our cycle. Even if we presume that the Reapers simply didn't believe total defeat was possible, losses certainly are possible if you let the organics develop mass effect drives and so forth.
Though this isn't actually a problem as long as organic civilizations' flourishing really is of value to the Reapers, something that they're willing to accept some losses to permit.





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