I can't speak for everyone, but for myself, I feel a bit paralysed by indecision when its a write in option, especially when is a world I don't know a lot about.
For Eg, I've thought about suggesting a plan where we pretend to be working for some group or other the thieves might want to approach but I don't know enough about the society to think of what group might be plausible, or if its not really a realistic plan. So I didn't say anything, and hoped someone would come up with a plan I was enthused over.
Loving the quest so far though!