What happened, Gmail?
Email was meant to be kept simple, and Google is making this exponentially hard with every single "design" iteration. 
Get off Gmail - it'll break your email.The article has very good points, especially when it touches the issue of "hidden" mail, like the promotions tab: there are labels and tabs. There should be only one system, and no, don't hide things from the user at this level. When there's 17k mails in promotions, eating up 6GB alert them, let them know.
(This ties back to how WordPress keeps hiding anything technical from users, which is also bad[^1])Filtering on Gmail is outrageous, especially when you compare it to Sieve. No option to match on custom header, seriously?Things like unprintable email is a bad joke. Unprintable? What if I connect to Gmail with mutt? It gives the sense of a false security.I'm aware of all the arguments against email, but so far nobody could come up with a robust, reliable (see SMTP retries), async, world wide, federated solution, that even touches the level of email.Here's a revolutionary idea: instead of trying to come up with a new email, stop breaking the current one, and keep using it.[^1]: https://www.rarst.net/wordpress/technical-responsibility/