Perhaps the Battlefield Has Shifted?
I'm not at all convinced that people have somehow magically become less dedicated to tribalism. I do wonder if the battlefield has changed. Our brave new cloud world has taken away all of our precious on-prem hardware pets and turned them all into cloudy, expendable cows. Few seem to care about hardware anymore, and like them or not, any of the big OSes can run cloud-based workloads (to varying degrees of performance and success).
What's left to fight over, then? Well, are there holy wars raging in the areas of agile methods, development tools, containers, hypervisors, and/or HCI technologies?