The more I think about 5e's conception of a Bonus Action, the more confused I get by what it's supposed to abstract. The way that Bonus Actions are set up seems to imply they're faster/less complex than regular Actions. You get an Action to do something complicated—like making a full suite of attacks against an opponent—and then a Bonus Action to do something extra, like getting an off-hand weapon attack, or disengaging as a Rogue.
But then, you get to something basic, like Readying an Action. "I want to prepare to cast Misty Step, so that when my opponent tries to cross the bridge, I telep…