Interesting to hear the boys love writing when it is on their terms. If they can write about what they want to write about, then they are keen. If they are told what they are to write about and how, then the ideas and passion don't flow so freely.
All of my boys prefer to type, rather than hand write.
And all but one, like being given the time to plan their writing first.
Some boys prefer to write on their own and some prefer to write with others. I let my boys choose for this task.