I think the fundamental aspect of flow is that it requires a high amount of cognitive engagement. Most of the time you're just not getting that from interacting with an LLM because the process is relatively passive. There are also forced breaks while it does its internal CoT which breaks flow.

I think a lot of people get a sort of novelty effect when first interacting with an LLM which can feel superficially like flow, but it's different in that it eventually wanes and what really happens in practice is you're encouraged to disengage and this makes it almost impossible to get into a true flow state.

The risk here I think is that if you get humans disengaging from the task at hand, there's a higher chance of bugs being introduced. You might move slightly faster in the short term but be forced to hit the brakes in the medium/long term.