There are a handful of benefits of having an XBox even if you have a PC. Mainly via Game Pass as they put a fair number of things onto the Xbox Game Pass that aren't on the PC side of it (including some "Day 1" titles). So if you are going in for the Game Pass, there are some benefits to having an XBox still. Just as an example, there are currently 381 things on Game Pass for the XBox, and only 270 for the PC version.
Also if your computer is actually a potato. Though that is slowly becoming less important as well with game streaming as it becomes more viable. They're running beta on their cloud gaming portion of Game Pass so as long as you have decent connection speed, hardware is going to be less of a concern.