Production environment is typically in the corporate world, not usually a homelab. Service providers often have a SLA uptime guarantee of 99%. They don't often push patches as soon as available due to the varied nature of corporate environment. They don't have one or two PCs to worry about: they can have tens of thousands. Downtime equates to money lost. So patches get tested before being deployed. Depending on the patch, that can be 48 hours to a week or two. Major OS upgrades can be months-long test, but the company usually does that and follows it while it's still in beta.

Updates are pointed to a server the company controls, not the Internet. Updates get tested on test servers and test machines that replicate those in production. It typically gets monitored for 48 hours to measure glitches and performance. Once satisfied, the company controlled update server pushes into production machines.

Why test patches before deploying to productions?