We actually started with having "Select All", "Deselect All" and "Submit", but users complained about the two clicks flow, and so we changed. UX is hard. I ten

We actually started with having "Select All", "Deselect All" and "Submit", but users complained about the two clicks flow, and so we changed. UX is hard. I tend to think that the one click flow serves users and respects their time more, even if it comes at the cost of having confusion about the difference between "Confirm my choices" and "Reject all". It's bad when consent managers confuse users between agreeing and disagreeing, but if we're making users confused between two good options, I personally think it's an okay price for a one click and you're done experience.