Although I love using my iPhone X, I have a gripe with how the App Switcher works on this particular device. More specifically, you need to tap and hold on App Switcher cards before you can swipe up to force-close their respective apps.
Given that this two-step process isn’t required on any other Apple handset, it took me a while to get used to, and I still don’t like it. On the other hand, anyone on the same page can now take advantage of a new free jailbreak tweak called SwipeUptoKillX by iOS developer CydiaGeek.