It requires three clicks to edit the subject line and I still sometimes click in the wrong place trying to find it and I've edited subjects dozens of times. It also requires it to open in a different editor. The default reply window is a tiny piece of shit by default. They added the stupid tabbed system that I turn off every time I have to make a new gmail account. It's not always clear whether I want Google or Gmail settings to change some preference, and the buttons for them are right next to eachother. Hangout chats blink until you click within that specific hangout box. I can't even find the option to link GMail accounts but I know I've done it before. If you hit reply and make no changes then close it, it saves it as a draft. Spam and Trash folders and all labels are hidden by default (have to expand). I could go on.