I think consolidation has also lead to this knowledge/experience, at least among younger engineers, being siloed in larger companies rather than spread out amon

I think consolidation has also lead to this knowledge/experience, at least among younger engineers, being siloed in larger companies rather than spread out among many smaller companies. I started in the industry when the Internet was still relatively new, and at that time most companies I worked with had their own ASN & address space and were running BGP, whereas nowadays most companies just use the cloud.