I do use SpamSieve on macOS for additional client-side spam-filtering, which helps. But I don't want to stress: no spam solution should ever just discard email

I do use SpamSieve on macOS for additional client-side spam-filtering, which helps. But I don't want to stress: no spam solution should ever just discard email without you being able to review it. None of them are good enough for that. I have delegated accounts in Gmail that years in Google still every day has false positives. It's a lot of email that would just vanish if I trusted server-side spam filters enough to never let it see my inbox.