Depends what you use it for. I don’t think email is a single thing in that regard. For example I’ve used it as a backup method for important files and also as 2 factor. Those are wholly different things that warrant different solutions. The majority of email volume is not person to person communication but part of some corporation/spammers/scammers business model who at best, like my bank, is using it to shift liability away from themselves onto consumers and at worst is attempting to defraud me of all I own. It’s still useful in business, maybe, but pretty sure teams/slack/… will win eventually.