The source of conflict I have seen most is when one person thinks they can do what someone else does better, often without reflecting that if this were true, th

The source of conflict I have seen most is when one person thinks they can do what someone else does better, often without reflecting that if this were true, they would already be doing it. The other thing is that engineering managers are often former engineers who mostly operate in the concrete, with closed loops, transactions, and controls, metrics, and outcomes, where product managers are typically former sales eng, architects, consultants, and others who deal in managing open loop dynamics, alignment, positioning, risk, power, signalling, impressions, and desire. These are really different foundations of experience and even worldviews. One can do the other to a point, but I haven't seen generalists outperform specialists in either domain.