Comment by stolenmerch

A problem with the X-Card concept is that it can only be used within the pre-existing Overton Window of the group anyway, so you might as well ditch it in favor of normal social negotiation. For example, X-Card guidelines always tell players they can use it to block anything they're uncomfortable with. However, you'll quickly learn you can't use it to block political ideology from the DM, even if you legitimately find it triggering and distressing.