Ok, so why is this worthwhile? Is it that much of a time-saver compared to selecting these commands from the menu bar or context menu? Naturally, no. But what those now antiquated methods require is a brief pause in your workflow. It's far less musical to move a mouse across a screen, right click, look for the correct command amongst the tiny texted options, and click it than to press in the keyboard shortcut. In some small way, I feel these kinds of small improvements add up to make a big difference in the creative focus and momentum you can bring to your music-making.