It's a definite weakness. But I'm a single developer, and when I tried to support my apps on both macOS and iOS I think quality suffered (and my stress increased). Right now my singular focus is TaskPaper for macOS, and as a result I think it's the best and most polished app that I've created.
Eventually I do plan to start other projects, be it and update to WriteRoom, TaskPaper for iOS, or something else. But I don't expect to do that until I feel like TaskPaper for macOS is in a healthy "done for a while, doesn't need me to think about it" state. It's not there yet!