I'm not real clear why we need DevOps. Shouldn't the developers be doing all that stuff for themselves? Back in the day when I was a sysadmin, I took care of

I'm not real clear why we need DevOps. Shouldn't the developers be doing all that stuff for themselves? Back in the day when I was a sysadmin, I took care of stuff like performing backups so the developers didn't have to. But when I became a developer I did much of what today's DevOps do. I'm not real clear why we even need DevOps.