Microsoft testing updates? They have an extremely bad track record of that.

My information might be a bit outdated, but Microsoft themselves only test on virtual machines and let their Windows Insiders to the rest. Unfortunately that doesn’t include many use cases in production.

So we sysadmin have to either test all Microsoft software/updates ourselves and/or fix mistakes from Microsoft after it was rolled out. That has caused thousands of hours of downtime this year alone in my company. All users combined that is.

Unfortunately management just believes whatever the sales/marketing teams tell them.