SE profs talk about large systems. Many people working for years on the same application, all doing a small bit. The hard part lies in getting correct requirements and hoping they don't change too soon. Integrating all the little parts into one big working system.
Programming is easy. Software engineering is still an unsolved problem. And, in my opinion, not any closer to a solution than in the seventies.
The CS profs likely are a bit like math profs, in that they leave such picky details as an exercise. Strings are abstracted as sequences of characters, not the relative mess of UTF-8, time runs forward every second, months and years, let alone leap years and leap seconds do not exist, time zones, let alone time zones changing over time, do not exist, etc.
The software engineering profs likely know how much time and effort solving those trivial smaller problems take.