My company did it's own research and found it was sales professionals who could not be trusted with WFH, but engineers for the most part were just as productive

My company did it's own research and found it was sales professionals who could not be trusted with WFH, but engineers for the most part were just as productive ..However, they found they their teamwork and multi-departmental collaboration suffered immensely and were not willing to make technology investments when people could just go into HQ or the many other offices we have.