I wonder who else you miss
An important thing to note about building your software team....there is probably no magical must-have person out there. I'm really happy with the team I built, so yeah it doesn't matter who I've missed. I'm sure I've missed lots of good people, but I only have so many slots to fill and there are more good engineers than there are slots.
So for the networking (or rather the reluctance to do it) its not a question of "clueless company misses good people". Its "What do I do personally to maximize my probability of getting a job?". If you're not willing to network, then your probability just went down. As a hiring manager, I don't really care. I already have more resumes than positions to fill.