Like I said, it's anecdotal, but I've known people who've transitioned to those fields. There is sometimes an issue of conflating IT to CS, but the converse seems to happen much more in my (again, anecdotal) experience. In that case a mediocre engineer with some software experience is crammed into an IT role because the engineering team doesn't really want them. If a SE adds a lot of value to an engineering team they are usually very reluctant to give them up.