Yes, you can indeed plan your workouts, export to the device and then see the corresponding event logged.
But that is only one use case (which is indeed particularly useful when training towards a concrete event like a half marathon or so). For someone who just very steadily does a weekly base, threshold and interval run (sometimes even using the Garmin Fit app on the iPhone when on business travel), all this planning and subsequent exporting to the device is just overhead as opposed the easy logging facility we had. Generically speaking, a tool should accommodate the relevant use cases and not the other way around.
And... they could have easily built both functionalities in the previous view as well...