I think this is one of the most important things, and is often not given enough emphasis:
It’s really helpful to have as much understanding of this as possible, in as concrete terms as possible.
When others chime in on others’ feature requests, this is also the part I am usually looking for, as different people often have slightly different problems.
Additionally, knowing how people currently solve that problem is also very helpful (e.g. what your current workaround or alternative solution to the problem is).