It makes sense
Arguably in some ways xA is a more useful metric than xG. A top quality striker can outperform xG by being good.
WIth assists though you're at the mercy of who you are assisting. You'll have a much higher assist number if it's Isak you're creating the chance for vs Gayle for instance.
it's just a way to measure the amount and quality of chances created. As with any other stat it's not the be all and end all.