Your engineers do want to fiddle with new technology. Engineers who understand Kubernetes are far more attractive to the market right now than those who don't. But this doesn’t have to be a bad thing, and enabling your engineers to use well-adopted and significantly-hyped (for good reason) technology is a great way to attract and retain talent.
Kubernetes has a ton of hype around it. We're just at the beginning of that hype. Adoption by all three major clouds of Kubernetes managed offerings and the proliferation of tools and companies in the ecosystem is proof the hype isn't all just smoke and mirrors.
