I mean, isn't it basically a homework aid? While it's definitely cheaty, I can understand why it would appeal to kids who just want to get their homework done fast, or people who are stuck on exercises and want a hint.
> This is like having an app run a marathon for me - it's easier, but I'm not changed through the work.
I'm not advocating that students use this to cheat on their homework. I'm just pointing out that most people reading an algebra textbook aren't in there for self-improvement. They just want a good grade.