Devops is a professional movement to codify knowledge about how web companies operate at scale and speed. It gets misinterpreted sometimes (more lately as it becomes a fad). Doesn't mean its bullshit. Same problems with Agile, Lean, Six Sigma, or any other codification of how humans could or should work together to deliver a product.

Many of the lessons learned here aren't exactly universal, for example some of the better Devops cultures (e.g Google) do have separate dev & ops teams, they just have good collaboration.