I think Intel having their own manufacturing fab is hurting them in the longterm. By outsourcing it you can go with whomever has the best solution. By matter of pride, Intel has not done this but AMD, Nvidia, Apple all do this.
But it's a brittle model, if a company screws up a node and is too messed up to handle the failure gracefully, as Intel is doing with their "10nm", no doubt with pride as a factor. And it's not uncommon for institutions to permanently lose abilities, I'm not counting on Intel succeeding with their "7nm" node.
On the third hand, we're now down to 2-3 high end CPU fab companies, Samsung, TSMC, and maybe Intel. That also can be a brittle thing.