I'm not sure that's anything new - I find the email notifications of PMs that I'm in (new or ongoing) reasonably reliable, likewise ones re-staff matters, but the ones for public threads seem, as you say, pretty random. I select 'all unread', uncheck the ones I want to preview as emails (i.e. mainly 'important' PMs and staff ones), and delete the rest. The alerts on the top bar are similarly random. There's not much we can do, I'm afraid, I guess XenForo has some algorithm that decides what to include, but the logic of its operation seems wholly obscure.Email notifications are currently completely random: I get them for some threads but not others.