Actually it will taste more bitter, try this: make an espresso shot, and scrape off the crema. Stir the shot and taste. Then taste the crema. You’ll notice that the crema has significantly more bitterness than the rest of the shot and actually tastes kinda bad on its own.

So a long black once fully mixed will taste very similar if not identical to an Americano, but before that it can be a more dynamic drink that allows you to experience more angles of your coffee over time rather than a singular experience that’s the same all the way through.