alt Hacker NewsThe point of a product manager is to make a lot of decisions that don't have a clear answer. "Should we use websockets or REST for our chat client?" - easy technical call. "Which market segment should we target with our features?" - not so technical.
There are plenty of technical decisions that don't have a clear answer (e.g. which of 1000 web frameworks should we use?), and plenty of product decisions that do. The separation between roles has nothing to do with clarity but with the (sometimes fuzzy) difference between technical decisions and product decisions.