Mail still sucks. Notification badges aren't always correct. If I get an email notification and I tap on it, it opens mail as normal. However when it opens, the new email(s) aren't there until after a couple of seconds. In iOS 12, it's already there in the inbox when I open mail. This applies to Exchange as that's where I get the vast bulk of my email. At this point in the betas, this type of longstanding bug shouldn't be around. I've removed and re-added exchange several times to no avail.