You can also just double-click on the title bar. I used to be mad that they switched the meaning of the + button, but once I discovered the double click trick I have been happy. I think it is even more convenient.

Another thing that made me mad in the past was when they switched New Folder from being Command-N to Command-Shift-N during the transition from Mac OS 9 to Mac OS X. Nowadays I tend to just make new folders in the terminal with mkdir.

The command-N change made it more consistent with most applications where “new” creates a window of some kind.

Besides, in the Keyboard section of System Preferences, you can remap any menu command to any key sequence that you want. (It is unfortunate that these mappings are as buried as they are.)

On a Macbook you can three-finger swipe through the fullscreen apps (and spaces) which is similar to app switching on mobile devices. That could be their intention.

Becuase most people struggle with multiple tabs, imagine how painful multiple tabs in multiple windows may get.