Ok so here's my take.
If you have a strong PC (you do), and are used to Steam/GOG/etc, Mouse+KB or pad for certain games, then there is mostly no point in having an Xbox.
However, big caveat if you have a library or even a handful of what you consider essential OG Xbox and 360 games you want to play. 7th gen console ports to PC were a mixed bag, and a lot of titles missed PC entirely during that time frame as well.
Ironically, Microsoft kind of pushed the XB over it's Windows/PC heritage, and those were some of the dark days for PC gaming IMHO. But if you want to play a lot of those console titles from that 6th/7th gen era, an Xbox is a good call. The Series X is probably overkill for that duty, even a Series S or last gen Xbox One X will do nicely for those.
For those that want to game at relatively* high performance levels without the insane GPU devastation grade markups and shortages, the price for an X1SS/X1SX/PS5 is pretty good provided you don't get scalped on that as well. If you're already covered on a powerful PC, ehhh. Only you can determine that, but in my opinion BC is the strongest argument for it.