My US unlocked T-Mobile S9+ (Oreo 8.0) has 1.1gb reserved.
My Husband has an US unlocked T-Mobile S9 (Oreo 8.0) which has 825mb reserved.
I agree that it's for video, must be carrier choice.
My wifi only Tab S3 went from 704mgs to 376mgs reserved memory on the October patch.
The performance has dropped significantly.

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