Would you say it's truly dead or that it fails to meet the performance bar you've described?

The reality is that most devs do not consider a holistic picture that includes the infrastructure they will be deploying to. In many cases, it's certainly a skill issue; good devs are hard to find. And to flip the coin, it's hard to find good ops people too.

The reason DevOps continues to linger, however vague a discipline it is, is because it allows the business to differentiate between revenue generating roles and cost center roles. You want your dev resources to prioritize feature work, at the beckon of PMs or upper management, and let your "DevOps" resources to be responsible for actually getting the product deployed.

In essence, it's a ploy to further commoditize engineering roles, because finding unicorns that understand the picture top-to-bottom is difficult (finding /top/ talent is difficult!). In this way, DevOps is well and alive, as a Romero zombie.