So your personal computer was not tied to a specific OS and you were easily about to get a refund for the license cost of the OS that shipped in box. So what’s the issue? Do you want hardware to ship without any software?
That's why so many people go with pre-built and don't even care about wiping and reinstalling the OS to get rid of the bloat. They want a fully functioning product from the moment they power it on so having the OS is a big deal.