I know 1 person with an Xbox One X. For casual gamers who don’t want the hassle of a PC (he doesn’t have one at all) it’s a good option. If the rumours of M$ bringing Steam to the Xbox turn out to be true it’d make it a really good value proposition for people who just want an easy system that has, with the addition of Steam, a massive amount of content available.
Said person is in my Steam family sharing so assuming it did happen one day he’ll have up to 1,300 games available for no extra cost.