if you played his old games, you can see that he improved a lot with each game, especially in the Sakura chapter. What I think is that he didn't finish his previous games because he has a kind of defect of wanting to try to start another work from scratch rather than continuing his work, that is, he preferred to stop the other games to try to perfect himself from scratch in a new work that is SAO NTR, and by doing that let's say he might feel like he's walking on the most paved road possible. I obviously hope he finishes this game, I don't want it to be fast, I want us to have a lot of content, mainly due to the fact that I saw somewhere that he intends to do two routes, one of netorase (which I don't like) and another route of pure netorare where Kiroto never finds out he's a cuckold (I think it's much better).