Janne Kylliö
Newcomer
The 360 was manufactured into 2016.
https://news.xbox.com/en-us/2016/04/20/xbox-360-celebrating-10-years/
On the other hand, Xbox One wasn't BC with 360 games from the start. When released, the Xbox Series S/X will be compatible with previous gen Xbox games.
When you can buy XSS, which is compatible with new and old Xbox games, for the same low price than Xbox One S it doesn't make sense to keep producing Xbox Ones.