AnkiDroid had a tutorial but it was never enabled before it got completely removed. It was said that we need better design and not good instructional onboarding.
I don’t hate the design changes Expertium is proposing, but I just seriously doubt they’ll have a really great impact on people. In the link you shared, the problem wasn’t that the user was unaware of what they were doing, they simply didn’t care.
Actually, we are having another discussion on learn ahead limit, and I find similarities between how people think in both cases. Most people know they are not helping themselves by taking these sub-optimal decisions, but they continue do those things. “But I’m still getting some benefits”.
By the way, @expertium have you not seen people with 1d+ learning steps despite there being a warning? I can bet this will turn out to be the same. The fact that “Again” moves review cards to relearning state or move you back to the first (re)learning step should be hint enough on what “Again” is doing. IMO for most people this is not even a intellectual issue.