Microsoft employed an army of testers to make Xbox backwards compatibility work
One of the draws of the Xbox brand is how it has a heck of a lot of games available on it from a bygone era. Backwards compatibility for Xbox 360 and original Xbox games was a big deal when it was announced several years ago at E3 by Xboss Phil Spencer, and since then Microsoft has continued to add classic games to the Xbox One and Xbox Series X system at a steady clip.