It is good to have a keyboard and a mouse method to do something. If my hands are on the keyboard then i can use that. If i have a coffee in one hand and the mouse in the other, then its nice to use the mouse.
depending on your work the distinction of applications is not very helpful. Suppose I have a couple of terminals of vim, one that I am compiling in, and one that i am looking at output in, some documentation in a webbrowser, some more documentation in a pdf, some plots in a pdf etc etc. Now i want to get from the documentation back to my editor.
Also I'd like a system monitor in the top panel. It was never there in the gnome 3 fallback. has it been revived in gnome3 classic?