Inbox by Gmail is sort of an oddball thing...it started out as a simple, "fast" alternative to traditional email. The thing with that is, while convenient at first, it was quickly noticed how much stuff is actually missing. You know, stuff that most users want to use on a daily basis.
Over time, Google has added in several necessary features to Inbox, making it much more serviceable than it was at launch. As of yesterday, text formatting in replies on the web joins that list, so users are now able to use numbered and bulleted lists; bold, italics, and underline; and enter links. While that in itself is pretty useful, keyboard shortcuts are also available with this update, which is basically a must for email power-users.
If you haven't tried Inbox in a while, maybe now is the time to give it a second look. I can't promise you'll actually like it, but you never know until you try.