It's a restriction in the code that also ties back to the user experience. Dialogs go over everything. Taking a screenshot is a fairly rare exception that makes sense no matter where you are but (almost?) nothing else even makes sense to do globally no matter which dialog you have open.
It seems at least plausible that long-press bottom left and bottom might be somewhat similar exceptions in the same way as long diagonal swipe doesn't get in the way of anything else, but then you might start seeing strange unpredictable inconsistencies on a per-dialog basis.
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