Most new PCs today come preinstalled with Windows 11. The hardware was designed to work with Microsoft’s latest operating system, and most models built for the consumer market don’t offer the option to install the older Windows 10. (PCs made for the enterprise market sometimes offer this option, but the price tag for these business-class PCs is typically higher.)
If you really don’t like Windows 11, can you buy one of those new PCs and downgrade it to Windows 10? Well, sort of.