Speaking as a former customer, their actual application is really not that great. I was subscribed over several months and while new features were sparse, nearly daily the app would update with fixes to the UI and backend. Existing features that became broken and fixed on a day to day basis and UI glitches all over the place. So while their core product, the AI, is the best on the market, everything they wrapped around that really isn't that great at all. So I'm not really suprised that their API is lacking as well. Just something to keep in mind, before using their product...
I also subscribed for a while and keep periodically coming back to it. Interestingly, I had the opposite impression. They keep adding a lot of fancy fluff: tracked quests, editable story context, predefined worlds, ... A constant stream of new bells and whistles meant to expand on the experience and incentivize you to spend money.
However, I feel all of these are actually good ideas crippled by the fact that they still don't address the actual problem: the underlying model is only nearly good enough to play an interesting adventure from beginning to end without it going off the rails. A typical session feels like a battle against the AI's tendency of losing the plot all the time. Either literally forgetting the storyline or producing utter non sequiturs. And when it doesn't forget where it's going, it instead keeps repeating itself and insisting on the same trajectory regardless of your responses, even after reaching a natural conclusion.
After tons of fiddling and undoing nonsense responses you finally got an adventure that made sense and you killed the demon lord at the end of your quest? Suddenly, he will tell you to hurry before his master, the demon lord, comes after you and you must stop him from conquering the world!
