For some recent companies, the problem never actually existed! They are doing everything correctly, but instead, the software engineering landscape has evolved so fast that the gap has been filled by tooling and cloud engineering.
The operation teams at that time managed everything from networking, server, virtual machine, OS, and software updates. This effectively hid a lot of manual operations. Not everything was manual, but it was before Puppet, Chef, and Ansible - or even Terraform existed.
AWS, born in 2006, was the first major cloud provider. DevOps was coined in 2008 and was not intended to solve a cloud-management problem but the real Silos between the operation of on-premise infrastructure.
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