Hi, can it be that "circumstances" here mean "reasons for using"?
The favourable circumstances are:
There are many incorrect, unnatural or confusing phrasings in this text. It is apparently written by a non-native speaker who has insufficient grasp of English to successfully write this type of material.
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There are many incorrect, unnatural or confusing phrasings in this text. It is apparently written by a non-native speaker who has insufficient grasp of English to successfully write this type of material.