Because generally you don't merely right click. You right click and then have to navigate a small menu of options to find the one you want. The big button on the ribbon is a huge target and is generally easier for users to hit and click.
And for some reason, I personally find right-clicking with a track-pad much more difficult than right clicking with a mouse, although I haven't taken a lot of time to analyze why as I generally use a desktop machine with mouse.
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Because generally you don't merely right click. You right click and then have to navigate a small menu of options to find the one you want. The big button on the ribbon is a huge target and is generally easier for users to hit and click.
And for some reason, I personally find right-clicking with a track-pad much more difficult than right clicking with a mouse, although I haven't taken a lot of time to analyze why as I generally use a desktop machine with mouse.
Or right click and have to navigate a huge menu of options, if enough third-party shell extensions have had their way with your context menu ...