In my experience, efficiency usually results in an increased level of resilience. You can easily sacrifice both, jeopardizing profits. Every time I saw that happen, it turned out some department-specific KPI (it doesn't matter which department, finance, production, sales, logistics,..) looked really good while that happened. All other sucked, but nobody cared. IMHO, this over emphasis on one silo, at the expense of all the others, puts so much stress on those other functions that they only can crack if something external puts even more stress on them. I guess that is what Covid and all the resulting disruptions is doing. Some orgs crack earlier than others, every one does have its cracking point so. The question is if an organization can adapt before it reaches its breaking point.

Southwest it seems reached it before others.