Yeah it's there, I just think it's hard to find. If I'm new to the app I won't immediately click playground then example. My first time using the app it took me a little while find it. I don't know if this was other people's experience, but here is what mine was.

I went to the website and logged in. I'm trying to imagine how I would use this application instead of Anki, how do I enter/organize information and how do I memorize it.

I'm greeted by a blank screen. Ok I've used workflowy before I see that I can generate some of type of hierarchical structure. But how would that information turn into cards? Ok let me click memorizing. It says I don't have anything to memorize.

Let me try to find an example so I can see how the cards works. Wow there is a lot on the screen, let me try clicking different things. Lots of clicks later... Ahh here's an example.

Clicked memorize. Oh that doesn't work, it doesn't apply to the example. Let me try to copy this over. Oh I can't. Ok looking at this example I know how to build out the relevant structure to generate the cards I want. Build out structure. Ok now I click memorize. SUCCESS!!

I think if I landed on deck, then I'd immediately see how to organize information. And when I clicked memorize it would work and show me how the organized information translates into cards. It greatly shorten the "arrival -> AHA" time.