Not only is GUI better for discovery, it's not even always true that CLI is better for doing the thing you want. Depending on the complexity of the task, building a tower of CLI commands/arguments can be a pain, and if it's something you do ~once a month, good luck remembering the syntax. A GUI lets you not even have to think about it, not have to memorise syntax or go out of your way to write a script to save it. And while CLI is great for things you do routinely... Windows still offers great CLI support, so you simply get the best of both worlds.