Yeah, I've found App Store rejections to be harsh (functionality is not useful? ok) or restrictive, but always parseable. I even successfully asked the reviewer if a certain change would remedy the issue, they said yes, I resubmitted and that was that. Took about 2 days in all.

Play Store rejections are either an algorithmic mystery or reviewer incompetence. I don't mean reviewer incompetence in using the (maybe unintuitive) app. I mean their internal review UI had some kind of unrelated error and they sent me a screenshot of that. Their own console UI even sort of urges you to just resubmit with a potentially meaningless change instead of opening an appeal / request. Feels like it's the worst of both automatic and human review.