Good Engineering Managers are teachers
The Good Engineering Managers are also good teachers, always sharing knowledge and inspiring folks to work with them.
The talent is abundant but it's whom they want to work with is scarce. If an Engineering Manager cannot influence or onboard the talent, the problem is with the Engineering Manager & not the talent.
A Good Engineering Manager largely operates as an Engineer (Good at the Craft) + Manager (Inspiration for others) than just the Engineering Manager.