Every page selling this role has a section called when to hire one. Read five of them back to back, which I did, and you will not find a single honest paragraph on when not to. The closest anyone gets is a note that very large companies should hire full time instead, which is still a pitch, just aimed at somebody else.
So here is the paragraph nobody selling the seat is going to write. Most companies asking this question are short a builder, not a leader. Getting that backwards costs about $55,000 in the first year and buys you a roadmap for work nobody is free to do.









