Most days I'm taking calls from people who's business machines have updated to Windows 10 and something has stopped working. What is the rationalle for forcing

Most days I'm taking calls from people who's business machines have updated to Windows 10 and something has stopped working. What is the rationalle for forcing people to upgrade the OS on business machines that are mid-life and doing their job perfectly well as is? It's not your decision Microsoft, and you're costing these people money.