In theory you could express most things as a flowchart but the complexity of doing that quickly escalates. A customer support bot that goes beyond informational answers might be a good example for something that is hard to express in a flowchart (without exploding complexity), but can be built in Rowboat.
Here is some personal experience: we previously built Coinbase's automated chatbot and we used a flowchart type builder to do that. This was a intent-entity based system that used deep learning models. It started great, but pretty quickly it became a nightmare to manage. To account for the fact that users could ask things out of turn or move across topics every other turn - we added in concepts called jumps - where control could go from one path to another unrelated path of workflow in on hop - which again introduced a lot of maintenance complexity.
The way we see it is that, when we assign a task to another human or a teammate we don't give them a flowchart - we just give them high level instructions. Maybe that should be the standard for building systems with LLMs?
Is this making sense?