I suspect he does enjoy development. Just doesn't want to do it all day, every day. He writes in terms of 'enjoying solving hard problems'. If we can assume

I suspect he does enjoy development. Just doesn't want to do it all day, every day. He writes in terms of 'enjoying solving hard problems'. If we can assume that's his motivation then 1) as long as his work includes hard problems he'll probably enjoy it and 2) being only allowed to work on the hard problems contained in the field of computing would be counter-productive.